The Invisible Girl by Lisa Jewell

In Hampstead, the lives of the Fours family and their neighbor Owen Pick collide when teenager Saffyre Maddox goes missing. A few years ago, Saffyre was a patient of child psychologist Roan Fours. His wife, Cate, secretly looked at Saffyre's file, because she (incorrectly) suspected Roan of having an affair with her. Saffyre herself has recently been secretly keeping tabs on Roan and his family. Owen, meanwhile, has just been put on leave from his job as a teacher because of complaints from students, and has drawn suspicion from Georgia Fours, the daughter of the family, because she felt he was "weird." When the police become involved, Owen finds himself in even more trouble. In The Invisible Girl, author Jewell explores the everyday lives of the Fours, Owen Pick, and Saffyre Maddox--their secrets, suspicions, and lies--as she takes us on the journey to discover what really happened to Saffyre.