This story about an Irish girl's coming of age has the strong whiff of traditional movie storytelling about it. And that's what makes it so entirely satisfying: It fulfills the need we often feel to be reassured about the stability of familiar things. But it also serves to support its theme, which is that nostalgia can be a trap, or to put it in a phrase that has become a cliché: You can't go home again. Eilis Lacey (Saoirse Ronan) feels stifled in her small Irish town, overshadowed by her pretty and accomplished sister, Rose (Fiona Glascott), and bullied by her vicious, hypocritical employer, Miss Kelly (Brid Brennan), so she decides to go to America. Helped by her church, she gets a room in a Brooklyn boarding house and a job in a department store, gradually loses her shyness and reserve, and falls in love with a sweet-natured young Italian American, Tony Fiorello (Emory Cohen). But when Rose dies suddenly, Eilis returns to Enniscorthy to see her mother and stays long enough to be courted by a young man, Jim Farrell (Domhnall Gleeson), and to begin to see the town in a very different light. The time approaches when she is scheduled to return to America, and she finds herself torn between not just Tony and Jim, but also the small but familiar comforts of the town and a promising but uncertain future in America. She also has a secret that she hasn't shared with anyone, but which the vicious Miss Kelly learns through the Irish-American grapevine. That this dilemma should play itself out with such freshness is a tribute to John Crowley's direction and Nick Hornby's adaptation of Colm Tóibín's novel, but also in very large part to a brilliant performance by Ronan. It's the kind of understated acting that sometimes gets overlooked among performances that chew the scenery with more fervor, but it earned Ronan a well-deserved Oscar nomination. It has to be said that she is supported by splendid performances by Cohen and Gleeson, with Ronan demonstrating a different kind of rapport with each actor. A quiet triumph, but a triumph nevertheless.