[2] Escaping from China with a microfilm of the formula for the mysterious "Lotus X", Lord Edward Southmere, a King's Messenger, is chased by a group of Chinese spies.

Back in London, Lord Southmere runs into the Natural History Museum and hides the microfilm in the bones of a large dinosaur skeleton.

The spies eventually find the microfilm at the museum inside the bones of another large dinosaur skeleton, and all misunderstanding is set aside, with good results for all.

The book on which the film was based, The Great Dinosaur Robbery, was aimed at an adult audience by its authors, Robert Forrest Webb and David Eliades, and was set in New York.

The authors were disappointed that the humour of the film was aimed at a very much younger audience than that in the book, which had been published, in several languages, extremely successfully throughout Europe and also in Australia, New Zealand, and the U.S.