Out walking with his wife, Lauren, beside the river Tyne, Tom Seymour instinctively risks his life to save a young man who they happen to notice just before he jumps into the icy current. Tom's spontaneous act saves the life of someone whose past, as well as his future, he feels a sense of responsibility towards. Recently released from prison, and living under an assumed name, Danny Miller was tried for murder as a ten-year-old on the basis of Tom's testimony, and assessment of him as a psychologist and an expert witness. When Danny asks Tom to help him sort out his life—beginning with his past—Tom is drawn into a lonely, soul-searching reinvestigation of the child murderer's case.