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- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the lion's tail, by Harper Paris ; illustrated by Marcos Calo
- Daphne definitely doesn't do sports, by Tami Charles ; illustrated by Marcos Calo
- The Substitutes, an Up2U Action adventure, by Kathryn Lay; illustrated by Marcos Calo
- The ballgame with no one at bat, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The ride that was really haunted, by Steve Brezenoff ; illustrated by Marcos Calo
- The Mount Rushmore face that couldn't see, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery at the coral reef, by Harper Paris ; illustrated by Marcos Calo
- Eddie Red undercover, mystery on museum mile, by Marcia Wells ; illustrated by Marcos Calo
- The mystery across the secret bridge, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the secret society, by Harper Paris ; illustrated by Marcos Calo
- The ride that was really haunted, by Steve Brezenoff ; illustrated by Marcos Calo
- The seals that wouldn't swim, Steve Brezenoff, illustrated by Marcos Calo
- The mystery across the secret bridge, by Harper Paris ; illustrated by Marcos Calo
- The mystery in the Forbidden City, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the mosaic, by Harper Paris ; illustrated by Marcos Calo
- Doom at Grant's tomb, written by Marcia Wells ; illustrated by Marcos Calo
- Mystery in Mayan Mexico, by Marcia Wells ; illustrated by Marcos Calo
- The seals that wouldn't swim, by Steve Brezenoff ; illustrated by Marcos Calo
- The outlaw from outer space, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The disappearing fruit, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The library shelves, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The cave that shouldn't collapse, by Steve Brezenoff ; illustrated by Marcos Calo
- The outlaw from outer space, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The Grand Canyon burros that broke, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the gold coin, by Harper Paris ; illustrated by Marcos Calo
- The gloomy ghost, a monsterrific tale, David Lubar ; illustrations by Marcos Calo
- The bowling lane without any strikes, by Steve Brezenoff ; illustrated by Marcos Calo
- Mystery on Museum Mile, Marcia Wells ; illustrated by Marcos Calo
- Mystery on Museum Mile, Marcia Wells ; illustrated by Marcos Calo
- The mystery of the suspicious spices, by Harper Paris ; illustrated by Marcos Calo
- Greetings From Somewhere: The Mystery of the Icy Paw Prints, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the icy paw prints, by Harper Paris ; illustrated by Marcos Calo
- The carnival caper, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The symphony that was silent, by Steve Brezenoff ; illustrated by Marcos Calo
- The dinosaur that disappeared, by Steve Brezenoff ; illustrated by Marcos Calo
- The disappearing fruit, an interactive mystery adventure, by Steve Brezenoff ; illustrator, Marcos Calo
- Mystery in Mayan Mexico, by Marcia Wells ; illustrated by Marcos Calo
- The Yellowstone kidnapping that wasn't, by Steve Brezenoff ; illustrated by Marcos Calo
- The messed-up museum, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- Wonder at the edge of the world, a novel by Nicole Helget
- The Everglades poacher who pretended, by Steve Brezenoff ; illustrated by Marcos Calo
- The missing bully, an interactive mystery adventure, by Steve Brezenoff; illustrated by Marcos Calo
- The mystery at the coral reef, by Harper Paris ; illustrated by Marcos Calo
- Mystery on museum mile, by Marcia Wells ; illustrated by Marcos Calo
- The mystery in the Forbidden City, by Harper Paris ; illustrated by Marcos Calo
- Doom at Grant's tomb, Marcia Wells ; illustrated by Marcos Calo
- Mystery in Mayan Mexico, Marcia Wells ; illustrated by Marcos Calo
- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The outlaw from outer space, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The disappearing fruit, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The Substitutes, an Up2U Action adventure, by Kathryn Lay; illustrated by Marcos Calo
- The Mount Rushmore face that couldn't see, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The ride that was really haunted, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the stolen painting, by Harper Paris ; illustrated by Marcos Calo
- The mystery at the coral reef, by Harper Paris ; illustrated by Marcos Calo
- Eddie Red undercover, mystery on museum mile, by Marcia Wells ; illustrated by Marcos Calo
- The mystery across the secret bridge, by Harper Paris ; illustrated by Marcos Calo
- The mystery of the secret society, by Harper Paris ; illustrated by Marcos Calo
- The mystery across the secret bridge, by Harper Paris ; illustrated by Marcos Calo
- The ride that was really haunted, by Steve Brezenoff ; illustrated by Marcos Calo
- Doom at Grant's tomb, written by Marcia Wells ; illustrated by Marcos Calo
- The bowling lane without any strikes, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the mosaic, by Harper Paris ; illustrated by Marcos Calo
- Mystery in Mayan Mexico, by Marcia Wells ; illustrated by Marcos Calo
- The mystery in the Forbidden City, by Harper Paris ; illustrated by Marcos Calo
- The seals that wouldn't swim, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the lion's tail, by Harper Paris ; illustrated by Marcos Calo
- The library shelves, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- Daphne definitely doesn't do sports, by Tami Charles ; illustrated by Marcos Calo
- The ballgame with no one at bat, by Steve Brezenoff ; illustrated by Marcos Calo
- The cave that shouldn't collapse, by Steve Brezenoff ; illustrated by Marcos Calo
- The outlaw from outer space, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The mystery of the gold coin, by Harper Paris ; illustrated by Marcos Calo
- The Grand Canyon burros that broke, by Steve Brezenoff ; illustrated by Marcos Calo
- The messed-up museum, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- Mystery on Museum Mile, Marcia Wells ; illustrated by Marcos Calo
- The mystery of the icy paw prints, by Harper Paris ; illustrated by Marcos Calo
- Greetings From Somewhere: The Mystery of the Icy Paw Prints, by Harper Paris ; illustrated by Marcos Calo
- Mystery in Mayan Mexico, by Marcia Wells ; illustrated by Marcos Calo
- The symphony that was silent, by Steve Brezenoff ; illustrated by Marcos Calo
- The carnival caper, an interactive mystery adventure, by Steve Brezenoff ; illustrated by Marcos Calo
- The dinosaur that disappeared, by Steve Brezenoff ; illustrated by Marcos Calo
- The disappearing fruit, an interactive mystery adventure, by Steve Brezenoff ; illustrator, Marcos Calo
- Mystery on Museum Mile, Marcia Wells ; illustrated by Marcos Calo
- The mystery of the suspicious spices, by Harper Paris ; illustrated by Marcos Calo
- The Yellowstone kidnapping that wasn't, by Steve Brezenoff ; illustrated by Marcos Calo
- Wonder at the edge of the world, a novel by Nicole Helget
- The Everglades poacher who pretended, by Steve Brezenoff ; illustrated by Marcos Calo
- The missing bully, an interactive mystery adventure, by Steve Brezenoff; illustrated by Marcos Calo
- The mystery at the coral reef, by Harper Paris ; illustrated by Marcos Calo
- Doom at Grant's tomb, Marcia Wells ; illustrated by Marcos Calo
- Mystery on museum mile, by Marcia Wells ; illustrated by Marcos Calo
- The mystery in the Forbidden City, by Harper Paris ; illustrated by Marcos Calo
- Mystery in Mayan Mexico, Marcia Wells ; illustrated by Marcos Calo
- The Yellowstone kidnapping that wasn't, by Steve Brezenoff ; illustrated by Marcos Calo
- The crook that made kids cry, by Steve Brezenoff ; illustrated by Marcos Calo