On her first day in the new role, Annika and the team are called in to solve the murder of a man found in the Clyde, a harpoon piercing his head. The investigation leads them to the victim's struggling boat business, where not everything is above board.

When a body is found on a boat in the Clyde, the case takes the team to the Isle of Bute. Evidence points to a jilted lover, but a darker secret emerges as the team investigate.

A young woman murdered on the Glasgow docks hits the team hard when Michael's brother is named as the next of kin.

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 murderer.

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

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