David Stevenson's already fragile marriage is shaken when his wife's personality starts to change after he finds baby on his doorstep.
DI Kenneth Naylor is on the hunt for a child killer, but can't find a way of getting close to the strange murderer.
His daughter is being haunted by something outside her window, something both fascinating and terrifying.
These three people are at different corners of a devastating mystery that threatens to destroy them all.