When the team arrive at a van abandoned on landfill sight they soon realise this is a case, the like they have never seen before. The van door is locked, the glass darkened, an angry buzzing inside. Phoebe is in the front seat, wasps crawling in and out of her open mouth: SAVE ME is written in blood on the windscreen. Red's analytical skills are stretched to the limit as he tries to fathom the workings of the mind of a killer determined to create their own Hell here on earth.

The serial killer continues the killing spree, and leaves a clue: the victims and their fates are inspired by the circles of Hell in Dante's Inferno.

Assisted by an authority on Dante, DCI Red Metcalfe knows the "sin" and "punishment" of the next victim, but struggles to establish how the victims are being chosen. Will he be able to locate the killer before the macabre sequence is completed?