Escaping from China with a microfilm of the formula for the mysterious "Lotus X", Lord Edward Southmere, a Kings Messenger, is chased by a group of Chinese spies. Back in London, Lord Southmere manages to escape from a chauffeur who is trying to kidnap him and then runs into the Natural History Museum. Chinese spies, led by Hnup Wan, follow him, so he hides the microfilm in the bones of one of the large dinosaur skeletons. He is relieved to meet his former nanny, Hettie, in the museum, and asks her to retrieve the microfilm. Southmere then faints and is captured by the Chinese, who tell Hettie and Emily that they are taking him to a doctor. Hettie and Emily enlist other nannies to help them search. They hide in the mouth of the blue whale display until after closing time and then begin looking over the skeleton of a Brontosaurus. They are unsuccessful and most of them have to return home to care for their children, but Hettie, Emily and their friend Susan remain to continue with the search. They are captured and taken to the spies' London headquarters, underneath a Chinese restaurant in Soho. The nannies are locked up in the 'dungeon', with Lord Southmere, but are able to outwit their captors and escape. Meanwhile, the spies have decided to steal the dinosaur, so that they can search it properly. That night, they trick their way into the museum. The three nannies follow on a motorbike and sidecar and watch from the shadows. After the Chinese load the Brontosaurus skeleton on the back of their steam lorry, the nannies steal the vehicle. The spies give chase through the foggy streets of London in their charabanc and a Daimler limousine, but the nannies drive into a railway goods yard, onto a flat wagon at the back of a train, and are carried off to safety. The nannies fail to find the microfilm on the skeleton. Meanwhile, back in London, Hettie's two young charges, Lord Castlebury and his younger brother, Truscott, have been captured by the spies. They are taken to the museum and the chief spy retrieves the microfilm from the other large dinosaur, a Diplodocus skeleton. The two boys are allowed home and tell Hettie the news. Realising that Lord Southmere is now in danger, Hettie organises a rescue. Hettie and her team of nannies invade the Chinese restaurant base and battle with the spies over Lord Southmere. Meanwhile, Emily and Susan return with the Brontosaurus skeleton and the lorry and bring the fight sequence to a shattering conclusion. Everything ends well and the secret of the mysterious "Lotus X" is finally revealed. It turns out that Lotus X is actually a recipe for Wonton soup, to which Southmere says that he tried to tell Hnup Wan that he was a businessman. Wan then advertises the recipe and makes peace with the nannies.
Cast
Derek Nimmo as Lord Southmere
Hugh Burden as Haines
Bernard Bresslaw as Fan Choy
Helen Hayes as Hettie
Joan Sims as Emily
Deryck Guyler as Harris
Peter Ustinov as Hnup Wan
Clive Revill as Quon
Molly Weir as Scots nanny
Andrew Dove as Lord Castleberry
Max Harris as Truscott
Max Wall as Juggler
Natasha Pyne as Susan
Joss Ackland as B.J. Spence
Arthur Howard as Thumley
Roy Kinnear as Superintendent Grubbs
Leonard Trolley as Inspector Eppers
Joe Ritchie as Cabbie
Percy Herbert as Mr. Gibbons
Joan Hickson as Mrs. Gibbons
John Laurie as Jock
Angus Lennie as Hamish
Jon Pertwee as Colonel
Kathleen Byron as Colonel's wife
Lucy Griffiths as Amelia
Aimée Delamain as Millicent
John Bardon as Bookmaker
Jane Lapotaire as Miss Prescott
Richard Pearson as Sir Geoffrey
Michael Elwyn as Haycock
Anthony Sharp as Home Secretary
Wensley Pithey as Bromley
Frank Williams as Dr. Freemo
Peter Madden as Sanders
Erik Chitty as Museum guard
Amanda Barrie as Mrs. B.J. Spence
About the book
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, both very experienced U.K. national journalists and best-selling authors, extensively researched material in New York and were greatly assisted by the American Museum of Natural History, which is situated alongside Central Park, and by the New York Police Department responsible for that area. 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..
The Diplodocus skeleton model was later used in Star WarsEpisode IV: A New Hope, in the opening scenes in the Tunisian desert.
Whilst this film was in production, Bernard Bresslaw and Joan Sims also appeared in Carry On Behind, another film being made at Pinewood Studios alongside One of Our Dinosaurs is Missing.