Ronnie and his new partner Joe are leading an investigation into the death of jeweller Harry Bernstein who is found dead with no hands or teeth.
The stabbing of Doctor Gardner, a psychiatrist who treated teenagers and children, leads Ronnie and Joe to question his violent adolescent clients.
A skeleton in a car boot at the bottom of the Thames sees Ronnie and Joe drawn deep into a case in which the law itself is in the witness box.
Ronnie and Joe are on the hunt for the killer of a seemingly innocent man when the investigation leads them to Ronnie's old boss, ex-DI Natalie Chandler.
When the body of an elderly woman is discovered at the foot of a well-known suicide leap, Ronnie wonders if there might be a terrorist connection.
A blood-stained hotel room and a stolen credit card lead Ronnie and Joe to believe a young woman gave birth there - but there is no trace of a baby.
When a spate of shootings claims one of Ronnie and Joe's own, the pair are left with little time as the next target seems to be CPS boss Henry Sharpe.
Still reeling from the shocking death of one of their team, Ronnie and Joe have a new case to deal with when an innocent young mother is stabbed to death in a busy London market place.