At a meeting in East London, art dealer Catherine Lacy is shown six paintings from a previously undiscovered artist, Aristide Bertrand, who moved in the same circles as Van Gogh. She is enormously excited, but her husband, security expert Tim Lacy, is less than thrilled when the agent concerned is fished out of the Thames.

Despite the danger, and swayed by the potential importance of this discovery, Lacy finally agrees that their new associate, Emma Kerr, should go to Provence - with veteran George Martin to keep an eye on her. Within days, Emma is abducted, and Lacy himself must go looking for her. But each time he gets a step closer to finding Emma, a new mystery comes to light, and finally he is faced with a terrifying new foe: the Camargue Brotherhood, who are prepared to protect Bertrand's work at any cost...