Patronimo's Apache tribe is still waging war against the white settlers. The damage on both sides is getting heavier and heavier - and Lucky Luke is called in to restore the peace between Patronimo's tribe and Colonel O'Nollan. But while negotiating with both sides, Lucky Luke is perceived as a traitor - and only a wild twist of fate will enable him to come out of this tricky situation unscathed. Can Lucky Luke mediate between the two parties and still be trusted by both sides?