The crooked house

the long version

"Alison lives her life under the radar. She has no ties, no home, and she spends her days at a backroom publishing job. Which is how she wants it. Because Alison used to be a teenager named Esme, who lived in a dilapidated house by a bleak estuary with her parents and three siblings. One night, something unspeakable happened in the house, and Alison emerged the only survivor. In order to escape from the horror she witnessed, she moved away from her village, changed her name, and cut herself off from her past. Only now her boyfriend invites her to a wedding in her old hometown, and she decides that if she's going to have any chance of overcoming the trauma of what happened, she'll have to confront it"--Amazon.com.