CID begin the investigation into the arson attack on the home of lottery winning family the Hendersons. Manson discovers that the fire started in identical fashion to two previous fires investigated by Nixon and Turner, at a foster home and a B&B. Warren Pritchard, the man jailed for the previous two fires, is re-arrested after the team discovers he was bailed at trial. Further digging clears him, not only from the Henderson fire, but the previous two, leaving CID back at square one. In uniform, Smithy leads the troops on a search for the car involved in Rod Jessop's hit and run, and it's not long before CCTV footage puts truant Kyle Henderson in the frame for the attack. However, with his brother watching his every move, Stamp and Hollis try to trip up a friend of Kyle's into exposing the truant's involvement. Meanwhile, Meadows and Heaton interview candidates for the new DI post, but Meadows tries to persuade Nixon to apply.