Book #6 of the Papa Pontivy series.
Pontivy decides to forego for a while chasing German agents and concentrate on another major issue plaguing his beloved France - the Black Market. It is wrecking havoc on the economy and bringing down morale so Pontivy decides to spend time investigating and he pulls Newman in to help. Newman has also been temporarily pulled by spy-hunting to go on an extended lecture tour for the Ministry of Information.
Inspector Marshall is again a major part of this adventure although he is temporarily on loan to the Ministry of Food.