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

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. 

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

Annika reflects on Jekyll and Hyde as she and the team investigate a Scottish millionaire found dead in his own shark tank.

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

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