A Single Man is based on a novel by Christopher Isherwood, and Ford’s–and Firth’s–gift is bringing the inner-turmoil world of the novel to believable, and devastating, life on the screen. Firth may be best known as a dashing romantic-comedy hero (Pride and Prejudice, the Bridget Jones films), but in A Single Man he demonstrates nuance and depth that will stay with the viewer long after the film is over.