An ambulance is forced off the road as it is carrying a famous patient in the back. The patient is then shot in the head.
Imogen's mother makes a plea for her daughter's safe return. Things happening between McGill and Connor threaten the investigation.
When a girl falls to her death from a ferris wheel, it is thought to be a tragic accident - until DS Satchell's aunt comes forward with suspicions of foul play.
Despite the presence of Tess, the police find the funfair workers unwilling to cooperate. An arrest is eventually made, a Romanian worker called Pavel, who had actually gone out with the girl who fell from the Big Wheel, but he is not the murderer. The big question still remains as to the part the development company may have played in the deaths at the fair.
DS Satchell and his family find themselves the target of a notorious crime family when he witnesses the slaying of an informer following a jewellery raid.
DS Satchell is desperate to find his wife and daughter now that they are misssing. Walker and Connor try to find the evidence to put the Bilkin family behind bars. Satchell decides to take matters into his own hands when he feels he has nowhere else to turn.