Commandant Michel de Palma follows an anonymous tip-off to a gated mansion by the coast and finds a body whose face is obscured by a fearsome tribal mask. Beneath it is a mysterious wound that could not have been caused by a bullet. Surrounded by scores of masks and painted skulls, de Palma hears the haunting strains of a primal flute from the floors above. With few leads to go on, de Palma delves...