The London detectives investigate a brutal attack on a popular art teacher at her college.

The team investigates the case of a badly burned young woman who has been dumped in the Thames.

In the team's investigation of a petrol-bomb attack, Jack sets his sights on a reprobate property developer who has so far managed to elude conviction.

After a teenaged girl is found naked and severely wounded, Charlie tries to identify the victim and connect her to the case of a recent girl gone missing.