| The Tower Treasure | (1927) | Description / Buy at Amazon |
| The House on the Cliff | (1927) | Description / Buy at Amazon |
| The Secret of the Old Mill | (1927) | Description / Buy at Amazon |
| The Missing Chums | (1928) | Description / Buy at Amazon |
| Hunting for Hidden Gold | (1928) | Description / Buy at Amazon |
| The Shore Road Mystery | (1928) | Description / Buy at Amazon |
| The Mystery of Cabin Island | (1929) | Description / Buy at Amazon |
| The Secret of the Caves | (1929) | Description / Buy at Amazon |
| The Great Airport Mystery | (1930) | Description / Buy at Amazon |
| What Happened at Midnight | (1931) | Description / Buy at Amazon |
| While the Clock Ticked | (1932) | Description / Buy at Amazon |
| Footprints Under the Window | (1933) | Description / Buy at Amazon |
| The Mark on the Door | (1934) | Description / Buy at Amazon |
| The Hidden Harbor Mystery | (1935) | Description / Buy at Amazon |
| The Sinister Sign Post | (1936) | Description / Buy at Amazon |
| A Figure in Hiding | (1937) | Description / Buy at Amazon |
| The Secret Warning | (1938) | Description / Buy at Amazon |
| The Twisted Claw | (1939) | Description / Buy at Amazon |
| The Disappearing Floor | (1940) | Description / Buy at Amazon |
| Mystery of the Flying Express | (1941) | Description / Buy at Amazon |
| The Clue of the Broken Blade | (1942) | Description / Buy at Amazon |
| The Flickering Torch Mystery | (1943) | Description / Buy at Amazon |
| The Melted Coins | (1944) | Description / Buy at Amazon |
| The Short-Wave Mystery | (1945) | Description / Buy at Amazon |
| The Secret Panel | (1946) | Description / Buy at Amazon |
| The Phantom Freighter | (1947) | Description / Buy at Amazon |
| The Secret of Skull Mountain | (1948) | Description / Buy at Amazon |
| The Sign of the Crooked Arrow | (1949) | Description / Buy at Amazon |
| The Secret of the Lost Tunnel | (1950) | Description / Buy at Amazon |
| The Wailing Siren Mystery | (1951) | Description / Buy at Amazon |
| The Secret of Wildcat Swamp | (1952) | Description / Buy at Amazon |
| The Crisscross Shadow | (1953) | Description / Buy at Amazon |
| The Yellow Feather Mystery | (1953) | Description / Buy at Amazon |
| The Hooded Hawk Mystery | (1954) | Description / Buy at Amazon |
| The Clue in the Embers | (1955) | Description / Buy at Amazon |
| The Secret of Pirates’ Hill | (1956) | Description / Buy at Amazon |
| The Ghost at Skeleton Rock | (1957) | Description / Buy at Amazon |
| The Mystery at Devil’s Paw | (1959) | Description / Buy at Amazon |
| The Mystery of the Chinese Junk | (1959) | Description / Buy at Amazon |
| Mystery of the Desert Giant | (1960) | Description / Buy at Amazon |
| The Clue of the Screeching Owl | (1962) | Description / Buy at Amazon |
| The Viking Symbol Mystery | (1962) | Description / Buy at Amazon |
| The Mystery of the Aztec Warrior | (1964) | Description / Buy at Amazon |
| The Haunted Fort | (1964) | Description / Buy at Amazon |
| The Mystery of the Spiral Bridge | (1965) | Description / Buy at Amazon |
| The Secret Agent on Flight 101 | (1967) | Description / Buy at Amazon |
| Mystery of the Whale Tattoo | (1967) | Description / Buy at Amazon |
| The Arctic Patrol Mystery | (1969) | Description / Buy at Amazon |
| The Bombay Boomerang | (1970) | Description / Buy at Amazon |
| Danger on Vampire Trail | (1971) | Description / Buy at Amazon |
| The Masked Monkey | (1972) | Description / Buy at Amazon |
| The Shattered Helmet | (1973) | Description / Buy at Amazon |
| The Clue of the Hissing Serpent | (1974) | Description / Buy at Amazon |
| The Mysterious Caravan | (1975) | Description / Buy at Amazon |
| The Witchmaster’s Key | (1975) | Description / Buy at Amazon |
| The Jungle Pyramid | (1976) | Description / Buy at Amazon |
| The Firebird Rocket | (1978) | Description / Buy at Amazon |
| The Sting of the Scorpion | (1978) | Description / Buy at Amazon |
| Night of the Werewolf | (1979) | Description / Buy at Amazon |
| Mystery of the Samurai Sword | (1979) | Description / Buy at Amazon |
| The Pentagon Spy | (1980) | Description / Buy at Amazon |
| The Apeman’s Secret | (1980) | Description / Buy at Amazon |
| The Mummy Case | (1980) | Description / Buy at Amazon |
| Mystery of Smugglers Cove | (1980) | Description / Buy at Amazon |
| The Stone Idol | (1980) | Description / Buy at Amazon |
| The Vanishing Thieves | (1981) | Description / Buy at Amazon |
| The Outlaw’s Silver | (1981) | Description / Buy at Amazon |
| The Submarine Caper / Deadly Chase | (1981) | Description / Buy at Amazon |
| The Four-Headed Dragon | (1981) | Description / Buy at Amazon |
| The Infinity Clue | (1981) | Description / Buy at Amazon |
| Track of the Zombie | (1982) | Description / Buy at Amazon |
| The Voodoo Plot | (1982) | Description / Buy at Amazon |
| The Billion Dollar Ransom | (1982) | Description / Buy at Amazon |
| Tic-Tac-Terror | (1982) | Description / Buy at Amazon |
| Trapped at Sea | (1982) | Description / Buy at Amazon |
| Game Plan for Disaster | (1982) | Description / Buy at Amazon |
| The Crimson Flame | (1983) | Description / Buy at Amazon |
| Cave-In | (1983) | Description / Buy at Amazon |
| Sky Sabotage | (1983) | Description / Buy at Amazon |
| The Roaring River Mystery | (1984) | Description / Buy at Amazon |
| The Demon’s Den | (1984) | Description / Buy at Amazon |
| The Blackwing Puzzle | (1984) | Description / Buy at Amazon |
| The Swamp Monster | (1985) | Description / Buy at Amazon |
| Revenge of the Desert Phantom | (1985) | Description / Buy at Amazon |
| The Skyfire Puzzle | (1985) | Description / Buy at Amazon |
| The Mystery of the Silver Star | (1987) | Description / Buy at Amazon |
| Program for Destruction | (1987) | Description / Buy at Amazon |
| Tricky Business | (1988) | Description / Buy at Amazon |
| Sky Blue Frame | (1988) | Description / Buy at Amazon |
| Danger on the Diamond | (1988) | Description / Buy at Amazon |
| Shield of Fear | (1988) | Description / Buy at Amazon |
| The Shadow Killers | (1988) | Description / Buy at Amazon |
| The Serpent’s Tooth Mystery | (1988) | Description / Buy at Amazon |
| Breakdown in Axeblade | (1989) | Description / Buy at Amazon |
| Danger on the Air | (1989) | Description / Buy at Amazon |
| Wipeout | (1989) | Description / Buy at Amazon |
| Cast of Criminals | (1989) | Description / Buy at Amazon |
| Spark of Suspicion | (1989) | Description / Buy at Amazon |
| Dungeon of Doom | (1989) | Description / Buy at Amazon |
| The Secret of the Island Treasure | (1990) | Description / Buy at Amazon |
| The Money Hunt | (1990) | Description / Buy at Amazon |
| Terminal Shock | (1990) | Description / Buy at Amazon |
| The Million Dollar Nightmare | (1990) | Description / Buy at Amazon |
| Tricks of the Trade | (1990) | Description / Buy at Amazon |
| Smoke Screen Mystery | (1990) | Description / Buy at Amazon |
| Attack of the Video Villains | (1991) | Description / Buy at Amazon |
| Panic on Gull Island | (1991) | Description / Buy at Amazon |
| Fear on Wheels | (1991) | Description / Buy at Amazon |
| The Prime-Time Crime | (1991) | Description / Buy at Amazon |
| The Secret of Sigma Seven | (1991) | Description / Buy at Amazon |
| Three-Ring Terror | (1991) | Description / Buy at Amazon |
| Demolition Mission | (1992) | Description / Buy at Amazon |
| Radical Moves | (1992) | Description / Buy at Amazon |
| The Case of the Counterfeit Criminals | (1992) | Description / Buy at Amazon |
| Sabotage at Sports City | (1992) | Description / Buy at Amazon |
| Rock ‘N’ Roll Renegades | (1992) | Description / Buy at Amazon |
| The Baseball Card Conspiracy | (1992) | Description / Buy at Amazon |
| Danger in the Fourth Dimension | (1993) | Description / Buy at Amazon |
| Trouble at Coyote Canyon | (1993) | Description / Buy at Amazon |
| The Case of the Cosmic Kidnapping | (1993) | Description / Buy at Amazon |
| The Mystery in the Old Mine | (1993) | Description / Buy at Amazon |
| Carnival of Crime | (1993) | Description / Buy at Amazon |
| The Robot’s Revenge | (1993) | Description / Buy at Amazon |
| Mystery with a Dangerous Beat | (1994) | Description / Buy at Amazon |
| Mystery on Makatunk Island | (1994) | Description / Buy at Amazon |
| Racing to Disaster | (1994) | Description / Buy at Amazon |
| Reel Thrills | (1994) | Description / Buy at Amazon |
| Day of the Dinosaur | (1994) | Description / Buy at Amazon |
| The Treasure at Dolphin Bay | (1994) | Description / Buy at Amazon |
| The Hypersonic Secret | (1995) | Description / Buy at Amazon |
| Cross-Country Crime | (1995) | Description / Buy at Amazon |
| Sidetracked to Danger | (1995) | Description / Buy at Amazon |
| Crusade of the Flaming Sword | (1995) | Description / Buy at Amazon |
| Maximum Challenge | (1995) | Description / Buy at Amazon |
| Crime in the Kennel | (1995) | Description / Buy at Amazon |
| The Cold Cash Caper | (1996) | Description / Buy at Amazon |
| High Speed Showdown | (1996) | Description / Buy at Amazon |
| The Alaskan Adventure | (1996) | Description / Buy at Amazon |
| The Search for the Snow Leopard | (1996) | Description / Buy at Amazon |
| Slam Dunk Sabotage | (1996) | Description / Buy at Amazon |
| The Desert Thieves | (1996) | Description / Buy at Amazon |
| Lost in Gator Swamp | (1997) | Description / Buy at Amazon |
| The Giant Rat of Sumatra | (1997) | Description / Buy at Amazon |
| The Secret of Skeleton Reef | (1997) | Description / Buy at Amazon |
| Terror at High Tide | (1997) | Description / Buy at Amazon |
| The Mark of the Blue Tattoo | (1997) | Description / Buy at Amazon |
| Trial and Terror | (1997) | Description / Buy at Amazon |
| The Rocky Road to Revenge | (1998) | Description / Buy at Amazon |
| The Chase for the Mystery Twister | (1998) | Description / Buy at Amazon |
| The Ice Cold Case | (1998) | Description / Buy at Amazon |
| The Crisscross Crime | (1998) | Description / Buy at Amazon |
| Danger in the Extreme | (1998) | Description / Buy at Amazon |
| Eye on Crime | (1998) | Description / Buy at Amazon |
| The Caribbean Cruise Caper | (1999) | Description / Buy at Amazon |
| The Hunt for the Four Brothers | (1999) | Description / Buy at Amazon |
| A Will to Survive | (1999) | Description / Buy at Amazon |
| The Lure of the Italian Treasure | (1999) | Description / Buy at Amazon |
| The London Deception | (1999) | Description / Buy at Amazon |
| Daredevils | (2000) | Description / Buy at Amazon |
| A Game Called Chaos | (2000) | Description / Buy at Amazon |
| Training for Trouble | (2000) | Description / Buy at Amazon |
| The End of the Trail | (2000) | Description / Buy at Amazon |
| The Spy That Never Lies | (2000) | Description / Buy at Amazon |
| Skin & Bones | (2000) | Description / Buy at Amazon |
| Crime in the Cards | (2001) | Description / Buy at Amazon |
| Past and Present Danger | (2001) | Description / Buy at Amazon |
| Trouble Times Two | (2001) | Description / Buy at Amazon |
| The Castle Conundrum | (2001) | Description / Buy at Amazon |
| Ghosts of a Chance | (2001) | Description / Buy at Amazon |
| Kickoff to Danger | (2001) | Description / Buy at Amazon |
| The Test Case | (2002) | Description / Buy at Amazon |
| Trouble In Warp Space | (2002) | Description / Buy at Amazon |
| Speed Times Five | (2002) | Description / Buy at Amazon |
| Hide-and-Sneak | (2002) | Description / Buy at Amazon |
| Trick-or-Trouble | (2002) | Description / Buy at Amazon |
| In Plane Sight | (2002) | Description / Buy at Amazon |
| The Case of the Psychic’s Vision | (2003) | Description / Buy at Amazon |
| The Mystery of the Black Rhino | (2003) | Description / Buy at Amazon |
| Passport to Danger | (2003) | Description / Buy at Amazon |
| Typhoon Island | (2003) | Description / Buy at Amazon |
| Double Jeopardy | (2003) | Description / Buy at Amazon |
| The Secret of the Soldier’s Gold | (2003) | Description / Buy at Amazon |
| Warehouse Rumble | (2004) | Description / Buy at Amazon |
| The Dangerous Transmission | (2004) | Description / Buy at Amazon |
| Wreck and Roll | (2004) | Description / Buy at Amazon |
| Hidden Mountain | (2004) | Description / Buy at Amazon |
| No Way Out | (2004) | Description / Buy at Amazon |
| Farming Fear | (2004) | Description / Buy at Amazon |
| One False Step | (2005) | Description / Buy at Amazon |
| Motocross Madness | (2005) | Description / Buy at Amazon |