Paris, spring 2015. Faustine travels to Syria with her little son to join ISIS; but, once in Raqqa, she soon realizes the hell she is gotten herself into. Her husband Sylvain quickly understands that the French government is powerless to help him, so he plans with some friends a high-risk extraction operation to get his family back.

Beneath her eccentric appearance, Captain Marleau is a formidable detective. Her Sherlock Holmes deerstalker cap, her character, her unusual appearance, her humor, her unpredictable behavior--Captain Marleau is not your average gendarme. She never rushes an investigation; she becomes the investigation and relentlessly pursues the suspects.