The team are relieved when Cheryl eventually admits to starting the fire at the Henderson’s house, but when Phil and Sam dig a little further into her past, they begin to wonder whether they have really found the Sun Hill arsonist. Elsewhere, Smithy and Lewis are called to a local market where they uncover a scam involving dodgy computer games. Lewis discovers his Gran, who he lives with, is moving to Jamaica to be with his mother, and, Sam announces to Phil and Stuart that she will be the new DI. But how will her ex-lovers take to her being their new boss?