Can a Welsh farmer's daughter who's become a publisher's assistant in the big city of Liverpool and a fisherman who's always lived on Ireland's western coast reconcile their ambitions and find a relationship beyond the heartfelt letters they've been writing? Discovering one's place in the world is the central issue in this popular romantic drama by Gardner McKay, who explores the question eloquently and intelligently. Shapeshifters Theatre, the resident company at the Irish American Heritage Center, emphasizes the story's regional cultures. But it never loses sight of the difficult decisions faced by star-crossed, sea-crossing lovers everywhere. Through 5/27: Fri-Sat 8 PM, Sat 5/20, 3 and 8 PM, Irish American Heritage Center, 4626 N. Knox, 773-282-7035, $15.