Acclaimed Irish director Lenny Abrahamson follows up his award - winning films Adam & Paul, Garage and What Richard Did with an offbeat comedy about a
young wannabe musician, Jon, played by Gleeson, who finds himself out of his depth when he joins an avant - garde pop
band led by the mysterious and enigmatic Frank, (Michael Fassbender) a musical genius who hides himself inside a large fake head, and his terrifying bandmate Clara, played by Maggie Gyllenhaal.