Get ready for fun, adventure, and intrigue with the first book in the iconic mystery series starring the beloved teenage girl detective, Trixie Belden!
Trixie can't believe she is stuck in Sleepyside all summer while her two older brothers are away at camp. She is going to be sooo bored. But then a millionaire’s daughter moves in next-door, a runaway kid hides out nearby, and rumors heat up that the old mansion on the hill is filled...

Trixie and Diana Lynch were friends for years before Di’s family became fabulously rich. So when Di’s long-lost uncle starts ruining her social life, Di turns to her old friend for help. But Trixie thinks Uncle Monty isn’t just an annoying relative–she thinks he’s an impostor!