New Orleans, 1919. As a dark serial killer - The Axeman - stalks the city, three individuals set out to unmask him. As Michael, Luca and Ida each draw closer to discovering the killer's identity, the Axeman himself will issue a challenge to the people of New Orleans: play jazz or risk becoming the next victim. And as the case builds to its crescendo, the sky will darken and a great storm will loom over the city…