The team investigate a missing persons case when a soldier suffering from PTSD fails to turn up to his mother's funeral.

The team reopen an old case of a fatal stabbing, after a criminal involved in the original attack is left for dead in a copycat crime.

The team are shocked by the shooting in broad daylight of a popular clergyman outside the boxing club that he runs for disaffected youths. Martha suspects that the vicar’s hug-a-hoodie approach has backfired - but the investigation soon moves into far darker territory…

When an elderly widow is brutally attacked in her own home on a notorious London estate, the team set out to find her attacker.