After the shocking death of Sergeant Mel Silver at the end of the last series the team is left to cope with the aftermath. Boyd ends up on suspension and the team is assigned a new female sergeant, Stella Goodman. As they are investigating a police corruption conspiracy, the remaining officers are suspicious of their new recruit. Is she a mole? Dr Felix Gibson is the team's new forensic scientist and pathologist, cool and capable she is not the least bit ruffled by Boyd's demands and antics. Will the new team manage to overcome their differences to crack the next set of cold cases to come their way in this compelling 12 part series?