Journalist Catherine Heathcote (Juliet Stevenson) solicits the help of investigator George Bennett (Lee Ingleby) for her documentary about the 1963 disappearance of a 13-year-old girl. But when Bennett abruptly stops cooperating, Heathcote begins to unravel some surprising truths. Now Heathcote may have to reevaluate her deep-rooted beliefs about justice. Based on the book by Val McDermid, this "Masterpiece" special co-stars Greg Wise.