The Bungalow Mystery - Carolyn Keene

Nancy believes her friend's guardians are trying to steal her inheritance. As she investigates, she has a perilous experience near the deserted bungalow. While driving a motorboat around the Twin Lakes, Nancy and her friend Helen get caught in a dangerous storm. Luckily, they are rescued by another teenage girl in a rowboat. They soon learn that their rescuer is Laura Pendleton, whose mother has recently having passed away. Laura has come to meet up with her new guardians, but something isn't quite right about them. Nancy investigates the situation, and soon she stumbles upon a shocking surprise in the cellar of a bungalow