Elias Carr 
Combination [PDF ebook] 

Dante only thinks about football. Miranda’s worried about applying to college. Neither one wants to worry about a locker combination too. But they’ll have to learn their combos fast-if they want to survive. Dante discovers that an insane architect designed St. Philomena High, and he’s made the school into a doomsday machine. If too many kids miss their combinations, no one gets out alive.