Bowen, Rhys The Last Mrs. Summers (0451492870)

Georgie's best friend, Belinda, inherits a spooky old house in Cornwall and asks Georgie to go with her to inspect the property. When they arrive, they meet Rose, a woman Belinda knew as a child when she spent her summers with her grandmother in Cornwall. Belinda never liked Rose, who has always been bossy and a bit of a bully, but when Belinda's house proves to be uninhabitable, Rose invites them to stay with her.

Rose is now married to Tony Summers, Belinda's childhood crush, and lives in the lovely house on the cliffs that he has inherited. Rose confides that she thinks Tony killed his first wife and now she is afraid. She asks Georgie and Belinda to observe Tony's behavior and their surroundings. Is Rose imagining things? Is Tony dangerous? In their quest for answers, they encounter a creepy housekeeper, Mrs. Manners, and learn that some kind of forgotten tragedy occurred on the property years ago involving them all.

There is a lot of strange to go around and things only get weirder--and deadlier--when one night a member of the household is found dead. All clues point to Belinda as the prime suspect. Now Georgie must uncover some long buried secrets that may prove the victim was really a villain before Belinda takes the fall for the murder.