The loner Erlendur has recently joined the police force as a young officer.
The beat on the streets in Reykjavík is busy: traffic accidents, theft, domestic violence, contraband... And an unexplained death.
When a tramp he met regularly on the night shift is found drowned in a ditch no one seems to care. But his fate haunts Erlendur and drags him inexorably into the strange and dark underworld of the city.