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Paris. At the bottom of a cellar of a building in Belleville, twelve bodies are found dead, bloodless.

The 36 is on the breach.

These facts remind Captain Julie Delorme of her first crime scene, thirteen years earlier, that of a child apparently suffering from dementia who had killed his parents to feed on their blood.

Convinced that there is a link between the two cases, Julie will face her oldest demon and embark on a high-risk investigation.