Tragedy strikes close to the Detective Department when an old friend of Superintendent Tallis walks to meet a speeding train head on. The suicide, prompted by the disappearance of the man's wife, has shocked the local community and leaves plenty for Inspector Robert Colbeck, the Railway Detective, to uncover. Whispers and rumours abound but did the dead man, Captain Randall, really take his own life in repentance for some harm he did his wife?