When down-at-heel French aristocrat the Duke de Buffo Buffo treads on a nail while dashing downstairs clutching a newly-discovered treasure map, he is forced to call on the services of eminent detective Alphonse Le Flic. Armed with the map and disguised as a French onion seller, Alphonse heads off across the Channel in his submarine, his destination a rambling cliff-top monastery. Having landed in England, his erratic cycling attracts the attention of the Frog Band, who give chase.
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