The Whisper Man by Alex North

Wow! This debut deals with a sensitive subject - kidnapped children, but what makes it truly frightening is that they think they have the child killer locked up and then the Whisper Man strikes again. Tom Kennedy is grieving for his dead wife and is struggling to raise their young son, Jake, alone. A new town, a new house and a new school are just what they need until they are told that they live where another child was abducted and Jake seems to still be talking to his imaginary friend and is not having an easy time of it at the new school. Then the whispers begin again. Intense and frighteningly real, prepare yourself for a long sleepless night because you won't put this one down.