Morwenna's missionary parents pay her a surprise visit and are taken aback by her relationship with Al. As Louisa starts her new counseling course, Penhale investigates a break-in at the school, in which nothing was stolen.
When a man is found murdered in a burnt-out car, DI Kate Ashurst and DS Emma Scribbins' investigation takes them into Millionaire's Row - the top end of the suburban scale.
Walker must re-visit his shadowy past in order to solve a spate of violent robberies.