When thirteen-year-old Ali spends the summer with her aunt and cousin at the family's vacation home, she stumbles upon a secret that her mother and aunt have been hiding for over thirty years. Just before summer begins, 13-year-old Ali finds an odd photograph in the attic. She knows the two children in it are her mother, Claire, and her aunt Dulcie. But who's the third person, the one who's been torn out of the picture? Ali figures she'll find out while she's vacationing in Maine with Dulcie and her four-year-old daughter, Emma, in the house where Ali's mother's family used to spend summers. All hopes for relaxation are squashed shortly after their arrival, though, when the girls meet Sissy, a kid who's mean and awful and a bad influence on Emma. Strangest of all, Sissy keeps talking about a girl named Teresa who drowned under mysterious circumstances back when Claire and Dulcie were kids, and whose body was never found. At first Ali thinks Sissy's just trying to scare her with a ghost story, but soon she discovers the real reason why Sissy is so angry. Sissy was actually Teresa's ghost sissy was just her nickname given to her by her big sister Linda. Soon after Dulcie finally tells Emma and Ali the truth about Teresa and they soon hire people to remove her bones from the bottom of the lake. After her bones are found and buried she is soon happy again, all is well, Sissy sees the light and soon goes to Heaven. Emma, Ali, and Dulcie can now enjoy the rest of their summer vacation. I would recommend this book for anyone who likes scary stories, or mysteries that end up happily.