Phnom Penh, Cambodia; the rainy season. When a French man, Hugo Quercy, is found brutally murdered, Commandant Serge Morel finds his holiday drawn to an abrupt halt. Quercy - dynamic, well-connected - was the magnetic head of a humanitarian organisation which looked after the area's neglected youth. Opening his investigation, the Parisian detective soon finds himself buried in one of his most challenging cases yet.