Wicked for the weekend
Carolyn Keene
Invited to play the part of a murder victim in the school play, fraternity president Michael Wentworth nearly dies when he is poisoned and turns to Nancy Drew for help in averting a determined killer.

by Carolyn Keene (1999)
When a chess master's sister is kidnapped, it's up to detective Nancy Drew to make all the right moves in this deadly game.
Carolyn Keene
Invited to play the part of a murder victim in the school play, fraternity president Michael Wentworth nearly dies when he is poisoned and turns to Nancy Drew for help in averting a determined killer.
Donald J. Sobol
Leroy Brown is back in the next six books in the Encyclopedia Brown series. As Idavilles ten-year-old star detective, Encyclopedia has an uncanny knack for trivia. With his unconventional knowledge, he solves mysteries for the neighborhood kids through his own detective agency. But his dad also happens to be the chief of the Idaville police department, and every night around the dinner table, Encyclopedia helps him solve some of the most baffling crimes. With ten confounding mysteries in each book, not only does Encyclopedia have a chance to solve them, but readers are given all the clues as well and can chime in with their own solutions. Interactive and funits classic Encyclopedia Brown!
Tom McCaughren
Four young boys find adventure involving ghosts and buried treasure when they set out to discover the secret behind the old legend of the golden key.
David D. Connell and Jim Thurman
Mathnet detectives Kate Monday and George Frankly use math skills like triangulation and scale to find a buried treasure in a ghost town.