Living in the luxurious Arcanum building—with its interior balconies perfect for playing tag, an elevator like an iron birdcage, and quirky neighbors behind every apartment door—has always been fun and games for twelve-year-old Minerva Keen … until her neighbors start getting poisoned. Anyone could be next, and everyone is a suspect, including Minerva herself. To clear her name and help the police crack the case, Minerva starts her own detective...