The Fonz and the Happy Days Gang end up in England 1899, where they meet Sherlock Holmes. The gang tries to stop Moriarty from stealing the Crown Jewels and using the jewels in a fiendish plot.
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We gotta hurry. If Fonzie's right, Professor Moriarty may attempt to steal the crown jewels at any moment.
And if my coward's intuition is right, were already too late.