Which Sister: A Psychologicial Thriller Novel

Three identical sisters are linked to a tragic drowning of a baby, with only one of them responsible, yet none will speak. Cassie, an aspiring art student, is hired by the notorious Marsden family to teach their sisters painting, but she soon uncovers a hidden agenda—one that involves uncovering a dark secret about the baby's death. As she delves deeper into the family's secrets, Cassie faces a revelation that could have devastating consequences.