When a phone with a brutal drowning recorded on it is handed in to MHU headquarters, the pressure is on for Annika and the team to track down the cuddleer.

The MHU are sent to Edinburgh to investigate the passing of a recently released prisoner whose body is pulled out of the Forth River, imprisoned in a dog cage.

Annika reflects on 1984 when the team are flown to the Hebridean islands to investigate the passing of a man found in a block of ice.

The team investigate a Scottish millionaire found dead in his own shark tank, leading Annika to reflect on Jekyll and Hyde.

When Morgan starts working at a remote Scottish eco-resort, Annika's trip to visit her is interrupted when a local builder employed by the resort turns up dead in a nearby stream.

A brutal cuddle on Glasgow's canals hits close to home when the victim is identified as a former police officer.