Meet DCI Cyril Bennett, a ladys man with a passion for efficiency. His partner, DS David Owen, is nave and untidy but keen. Together they make a formidable pair. When two dead infants are found at a Teacher Training College, Bennett and Owen are given the case. At the same time, a killer is on the loose staging attacks using sulphur mustard. Bennett and Owen must work together to bring to justice a killer with revenge on his mind.