Living in the luxurious Arcanum building - with its interior balconies perfect for playing tag, an elevator like an iron birdcage, and quirky neighbours behind every apartment door - has always been fun and games for twelve-year-old Minerva Keen . . . until her neighbours 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...