There are odd things afoot in Thornaby, again, Rips in the very fabric of time are leaving bewildered people hours out of sync with their lives. Then there's the strange nightly rumblings beneath the town--some say it's the sound of a ghost train. Arthur and Lawrence embark on an adventure more perplexing than any of Sherlock Homes and Dr. Watson's--can their detective ancestry (or something) help them crack the case?