The Green Dragon — J. Jefferson Farjeon

This young couple who have just eloped get into a car accident and a heap of trouble when they stumble into a tramp and the Green Dragon Inn. They have to solve the mysteries of why the Inn was abandoned, who locked the cook in the cupboard, and why the Chinaman is after the blind man's dog.

This newlywed couple find themselves in charge of the deserted inn. They then quickly find themselves surrounded by a bevy of strange people, various smugglers, thieves, and innocent bystanders who must get sorted out. Not just a mystery, but the story of a crime involving a stolen ruby from China.