Ten-year-old Cam, possessor of a photographic memory, and her friend Eric investigate what seems to be a brief appearance of U.F.O.s.

Encyclopedia Brown, brilliant fifth-grade amateur detective, solves ten crimes. The reader may match solutions with those at the end of the book.

Cam uses her photographic memory and her brain to solve two mysteries at the beach, involving a missing mother and a missing set of papers.

Nate the Great goes to San Francisco to solve a mystery with his cousin, Olivia Sharp, who is also a detective.

Nate the Great investigates two cases that may be connected, involving a missing valentine and a valentine that came from nowhere.

Scooby and the gang are having a wonderful time at Pop's Big Top Carnival until the mysterious Carnival Creeper shows up.

Marigold concocts a mystery that finally gets her and her friends into the boys' private eye club.

When he finds a torn piece of paper with only part of a word on it, boy detective Nate sets out to find the missing pieces.

Fifth-grader Cam uses her photographic memory, with help from her friend Eric and his twin sisters, to solve the mystery of Poochie, a famous can