Mugaldekoak is set in the early 40s, when, on this side of the border, the wounds of the Civil War were still open and, on the other, they were living under occupation by the German Army. The tale revolves around the Comète Network, an initiative developed during World War II on the border with Navarre: the clandestine evacuation of British pilots brought down in enemy territory.

Ten years after ratting on his old mobster friends in exchange for personal immunity, two hit men drive a hardened criminal to Paris for his execution. However, while on the way, whatever can go wrong, does go wrong.