The Dead Kid Detective Agency
(Book)

Thirteen-year-old October Schwartz is new in town; short on friends and the child of a clinically depressed science teacher, she spends her free time in the Sticksville Cemetery and it isn't long before she befriends the ghosts of five dead teenagers, each from a different era of the past. Using October's smarts and the ghosts' abilities to walk through walls and roam around undetected, they form the Dead Kid Detective Agency, a group committed to solving Sticksville's most mysterious mysteries. So when the high school's beloved French teacher dies in a suspicious car accident, it provides the agency with its first bona fide case, putting them in the midst of a murder plot thick with car chases, cafeteria fights, and sociopathic math teachers, and sending them on an adventure that might just uncover the truth about a bomb that exploded 40 years ago.