“Gabriel’s Inferno” (*1/2 out of four) was a laughably solemn adaptation of Sylvain Renard’s 2011 potboiler about a morally troubled professor (Giulio Berruti) who seeks personal/religious/moral redemption by beginning a tryst with one of his students (Melanie Zannetti) and thinks this can restore balance in his life. Director Tosca Muska handsomely films and designs this melodrama but it’s all-too-obviously inspired by (and ripped off from) “50 Shades Of Grey”, right down to its molasses pace and abrupt ending. Zannetti’s strong performance is one of film’s few assets.