October 1943. Nancy Dalton, working at the RAF base at Scampton in Lincolnshire, has been holding vigil for the Lancaster bomber pilots whose missions seem endless. But her watchfulness has not prevented her own pilot brother from failing to return. In the midst of mourning him, fresh recruits arrive to continue the war effort, among them charismatic Canadian Steve Allard. The months ahead will be long and hard, with danger a constant companion, and although both Steve and Nancy never intend to complicate wartime life with romance, their attraction becomes impossible to ignore.