Season 7, Episode 5
Ronnie and Sam suspect that an elderly woman's caregiver is to blame for her death.
A woman's body is found in the Thames. The investigation reveals that the victim was involved in a bitter custody battle with her abusive ex-husband, and that she may have been involved with her mother's new husband.
Season 7, Episode 3
A man is found shot to death in a hotel room. The investigation reveals the victim's money was stolen and that he owed thousands of pounds in unpaid child support.
Season 7, Episode 2
Sam is suspended and heads down a path of self-destruction.
Season 7, Episode 1
A suicidal man kills several people when he causes a catastrophic train crash.