"It's April 2020 and Edinburgh is in lockdown. It would seem like a strange time for a cold case to go hot-the streets all but empty, an hour's outdoor exercise the maximum allowed-but a mere pandemic doesn't mean crime takes a holiday. When a source at the National Library contacts DCI Karen Pirie's team about documents in the archive of a recently deceased crime novelist, it seems it's game on again. At the center of it, a novel: two crime novelists...

Detective Inspector Annika Strandhed and the Marine Homicide Unit return to solve more brutal and unexplained murders that wash up in Scotland's waters. The team is challenged as their dynamics shift, pushing them to rapidly adapt as they encounter murders more complex than ever before.