One year after the death of her mother, Elena, a young French woman of Greek origin, returns to her holiday home on the island of Lesbos. She is accompanied by her friends Nassim and Sekou, two young suburbanites more used to the benches of the city than the paradisiac beaches.

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.