The streets of Liverpool are abuzz with rumors of a demon known as Spring Heeled Jack loose in the city. Sherlock Holmes and Doctor Watson visit the city Bridewell to examine the body of one of Jack's supposed victims but find the officer in change, Inspector Thornton, unimpressed by The Great Detective's reputation. Meanwhile, a collection of mysterious, eldritch Australian Aboriginal artifacts arrive at the William Brown Museum while, in the city's underworld, crime lord Mr. Drummond comes up with a novel solution to the problem of a lost dog.