The Mysterious Visitor: Trixie Belden #4 (Unabridged‪)‬

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!