If you were born in South Boston you've started life on the wrong side of the tracks, so just making ends meet will need all the energy you can muster. Margie (Imelda Staunton) is a sharp-tongued single-mother on the edge. Hearing that an old boyfriend who has made good is in town, she decides to corner him, but when Margie's plan brings unexpected consequences for her and the unsuspecting Mike (Lloyd Owen), both must look to the past to re-examine the choices and secrets that brought them back together.