Danica and her partner Jack are Renley Crow's best kid detectives. Well, they're the only kid detectives . . . until Kennedy Fang moves to town. Kennedy's convinced his new house is haunted, and he needs Jack and Danica's help to figure out what's going on. The only catch? Kennedy wants to solve the case with them. Danica's not wild about working with her competition, but there's a bigger problem: her tita has forbidden her from meddling with the spirit realm. Not that Danica believes in spirits. But when Kennedy shows her a box of letters addressed to all three kids--letters that start to fly around his attic--Danica knows she can't turn down their biggest case yet. Even if it means uncovering scary truths about the world . . . and about herself.