A double murder, a public spectacle, a killer toying with the police. And then, from nowhere, a mysterious woman with a story to tell, a suspect handed to DI Buchan on a plate.

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It’s been a bad few months for Buchan and his team, little going right. They need a win. What they don’t need is a murder victim, the naked corpse of the young woman posed on a park bench, erotically summoning viewers to the scene of her death. Then a week later, a second victim.

Out of nowhere, a woman finds Buchan in the Winter Moon, claiming the posing of the corpses was based on two paintings by a little known Spanish artist. And she brings ill news; there’s a third painting in the series, and she herself will be the victim.

It is so unexpected, and so alien to everything they’ve investigated so far, suddenly it seems Buchan is carrying out an entirely new line of inquiry. However, as he gets closer to the heart of darkness, it becomes evident the two strands of the investigation are linked, the threat is imminent, and that the re-enactment of the third painting is close to being realised…