by Melissa Kantor (2009)
When new and unconventional high school student Amada Valentino disappears, her three closest friends, who are all from vastly different circles, band together and, using enigmatic clues that seem to come from Amanda herself, try to find her.
Wendelin Van Draanen
When her history teacher begins receiving death threats and her own name is near the top of the suspect list, eighth-grader Sammy is determined to find the real perpetrator, but she is distracted by her mother's relationship problems, her almost-boyfriend inexplicably avoiding her, and her duties as a reluctant bridesmaid.
N. Griffin
There's never a dull moment in Room 11. Smashie McPerter and her best friend, Dontel Marquise, are thrilled that their class and other third-graders will be participating in a performance to showcase their talents to their families and friends. Smashie desperately wants to sing, but is seems her teacher and classmates are determined to steer her in another, non-vocal direction. Smashie's hurt feelings are put to one side, however, as she and Dontel become caught up in an intriguing mystery. A jar of hair goop, vital to the success of a performance, goes missing under suspicious circumstances., and the two friends decide to don their Investigation Suits. But although they have a knack for solving mysteries through hard work and determination, their sleuthing doesn't always go over well with their classmates. Can they find the good stealer and mend fences before chaos brakes loose? --
Helen Wells
When Cherry goes to work as the nurse at a chateau-turned-boarding school, she and one of the students discover a formula that, when constituted to its exact specifications, produces a perfume that saves the school from bankruptcy.
Carolyn Keene
The Dean of Emerson College enlists Nancy to investigate the thefts of a valuable substance being used in a top-secret experiment. But when Nancy discovers that the experiment involves biological mutations, she knows she must find the culprit before the lives of everyone on campus are endangered.