On Eddie's birthday, the Millers try to celebrate like everything is normal. But a series of upsetting events threatens to send the family over the edge.

Jamie meets with a psychologist. He's reluctant to speak at first, but eventually he opens up about his complex feelings towards Katie.

The police look for answers — and the weapon — at Jamie's school. They can't get any leads from his friends, until DI Bascombe's son offers to help.

Police break down the door of the Millers' family home. Teenage Jamie is arrested and taken in for questioning but insists he's done nothing wrong.