Heike Lerner has a charmed life. ​​​A stay-at-home mother married to a prominent psychiatrist, it's a far cry from the​ damaged​ ​child she used to be. But her world is ​shaken when her four-year-old son​ ​befriends a little girl at a nearby lake, who​ vanishes under the water. ​And when Heike dives in after her, there's no sign of a body.

Desperate to ​discover what happened to the child, Heike​ seeks out Leo Dolan, a television writer exploring the paranormal​, but finds herself caught between her controlling husband and the intense Dolan​. Then her son disappears, and Heike's husband was the last to see him alive​...​