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 a.d the intense Dolan. Then her son disappears, and Heike's husband was the last to see him alive.