When unbeknownst to Gloria a microfilm cassette is left with her by a dying agent she becomes entangled in a complicated series of events. She's pursued by a dwarf and an albino and becomes convinced that they are out to kill her. Finally with the help of San Francisco detective Tony Carlson she begins to turn the tables on her pursuers. It becomes clear that the nerfarious crew after her are plotting a dastardly deed indeed - to assassinate the Pope as he visits the city to see _The Mikado_. Gloria and Tony must race against time to prevent this terrible crime.