Paris, 1938: Runaway heiress Juliette Willoughby perishes, with her married lover, in an accidental studio fire alongside her Surrealist masterpiece, Self-Portrait as Sphinx. Cambridge, 1991: Two art history students stumble across proof something sinister was at play in Juliette's death, threatening to expose the long-buried secrets of the artist's aristocratic family.

Dubai, now: An art dealer is accused of the brutal murder of his oldest friend – the last surviving member of the Willoughby dynasty.

Three suspicious deaths over the course of a century. Is the key to unlocking them all hidden in Juliette Willoughby’s lost painting?