It is a cold night and Sylvie Dugdale is weeping, as she walks by the Mersey. A figure approaches and, dodging, aside to avoid him, she falls into the river. Constable Brendon O'Hara, just coming off duty, sees the girl's plight and dives in to rescue her. He is dazzled by her beauty, but Sylvie's husband is in prison and the closeness that Brendon soon longs for is impossible.
Sylvie has to escape from Liverpool, so Brendon arranges for her to stay with his cousi Caitlin in Dublin until it is safe to return. There she meets Maeve, a crippled girl from the slums, who will change all their lives when a little girl is lost.