Five-year-old Ava Boone has been missing for six months. There have been no leads, no arrests, no witnesses. The only suspect was quiet, middle-aged Leland Ernest.

And Grace Wright has just bought the house next door. Recently divorced, Grace uprooted her two small children to start again and hopes the move will reset her crippling insomnia. But now she understands bargain-price for her beautiful new house.

With whispered neighborhood gossip and increasingly sleepless nights, Grace develops a fierce obsession with Leland and the safety of her children. Could she really be living next door to a child-kidnapper? A murderer?

With reality and dream blurring more each day, Grace desperately pursues the truth - following Ava's family, demanding answers from the police - and then a body is discovered...