The lies we told (2018)

"The highly acclaimed author of Watching Edie returns with a new novel of dark psychological suspense that explores how those closest to us have the most to hide... When Clara's boyfriend, Luke, disappears, everyone believes that he's left her, but Clara thinks she knows the truth. Recent evidence suggests that Luke had a stalker, and Clara worries that he's been kidnapped. Then Luke's older sister, Emma, who vanished twenty years ago, suddenly reappears. Emma wants to help Clara with her search for Luke, but she refuses to talk about what happened--even though it nearly destroyed her family when she vanished. And the deeper Clara digs into Luke's mysterious disappearance, the more convinced she is that the two incidents are connected"--