On her first day in the new role as head of the Marine Homicide Unit, Annika and the team are called in to solve the murder of a man found in the Clyde, a harpoon piercing his head.

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 as the team investigate, a darker secret starts to emerge.

When the body of a scientist is found in Loch Katrine, Annika is reminded of Ibsen's Enemy of the People. With so many people wanting him dead, it will be up to Annika and her team to work out who would have finally done it.

The team are called in when writer Cara Gibson is found dead under a bridge. Her books ruined careers and left a lot of lives in tatters, which means there are a lot of potential suspects to investigate.

Annika and the team are tasked with solving the death of a man that was seemingly loved by everyone he met. However it seemed that someone hated him as he was thrown in the river from a party boat.

A young woman murdered on the Glasgow docks hits the team hard when Michael's brother is named as the next of kin. Michael is taken off the case while his brother is investigated.