It all started with the corpses of two guys, natives of poor Parisian suburbs, found on the outskirts of Paris, in the Porte de la Chapelle quarter. Commissioner Jean-Baptiste Adamberg never wanted to give them to the Drug Department - and, it seems, he dug too deep... Then the mysterious Shadow intervened. Is she a nun Clarissa from an ancient age, a murderous nurse with a split consciousness, or someone else - a familiar stranger? The Commissioner is convinced that the threads of the crimes stretch from the distant past. But what does this have to do with the handsome deer torn to pieces in the Norman forests?