Late summer in Stockholm. Detective Sergeant Sakka Pienni has a couple of days left of her holiday when placards are filled with the news of a seventeen-year-old girl’s disappearance. When a call comes in about a female body found in a lake, Sakka is called in to the station. It is soon clear that the victim is not the missing girl – but who is she and why does no one seem to miss her?

The investigation takes an unexpected turn when the case shows disturbing similarities with an eighteen-year-old murder. Soon, Sakka and her team enter a world colder and darker than they ever could have imagined. In the midst of all of this, Sakka is troubled by memories from her past. What really happened the day her sister died?

A dark and psychological page turner, The Underground is the second installment in the series featuring Detective Sergeant Sakka Pienni.