Frankly first-rate.  Directed by American independent filmmaker Lenny Abrahamson, an aspiring musician, Jon (Domnhall Gleeson), experiences a journey of self-exploration after joining a band led by the eccentric and mysterious Frank (Michael Fassbender), whose face is permanently covered beneath a comically oversized mask. Not only is Frank is a good character study; weird behaviour and out-of-control situations are depicted throughout…