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The collapse of a tunnel exposes a collection of ancient skeletons and some more recent remains, leading detectives to believe the bodies could be linked to a double shooting

The investigation spreads to Bradford with the murder of another woman, a female police officer takes on dangerous undercover work, while danger is ever present for sex workers

When another woman survives an attack, detectives hope they are in with a chance of finding their man, with a driver in Leeds emerging as prime suspect

Downtrodden detective Jack Frost investigates when an unidentified man's body is found on top of a pile of glass at a council recycling centre. David Jason stars

Ed is left in charge of the endangered-species project at the clinic, where he meets a beautiful stranger who takes an interest in him - but Du Plessis is suspicious of her motives

A mystery woman arrives, claiming to be Ed's wife, while a shocking link is made between some seemingly unrelated animal deaths. Jill Halfpenny (EastEnders) joins the cast