When seniors in her high school begin succumbing to baffling manifestations of spontaneous combustion, Mara observes the efforts of FBI agents to solve the mystery while she struggles to survive through graduation.

"The unthinkable happens. Keisha forgets to do her science homework! The morning it's due, she rushes to Locker 37 and the locker gives her a clock. Not just any clock, mind you. It's a time-travel device that sends Keisha back to whatever time of day she wants during that particular school day, which means she can scrape together enough time in between her classes to finish her homework. Still, there's no time to help Carson with his stained shirt...

"It's the first day of the fourth grade at Arthimos Elementary and things are already off to a strange start--poisonous cookies, a zipline disaster, a missing iPad, and what are those strange sounds coming from the school custodian's wheelbarrow? Luckily the Prime Detectives--Abby "the Abacus" Feldstein, Cameron "Cam" McGill, and Gabriel "Gabe" Kim--are on the case! Using arithmetic, geometry, and logic, the Prime Detectives are sure to figure out...