Professor Wilkens has invented a formula for a new type of fuel and puts it on a microfiche that he sends to his daughter and her bodyguard, but multiple different mysterious groups, including the "Chinese Carnation", would kill to get their hands on it.

Donald Ramsey
Susan Bexter
Dr. Cecil Wilkens
Mary Lou
Reginald Sheridan
Leutnant Legget
Speranzo
Inspektor Travers
Professor Bexter
Gillespie
Kitty
Monk, the Barman