A suspected Western spy steals a secret microfilm from China and hides it in the skeleton of a museum dinosaur, prompting a frantic search for it by various interested parties.

It is a British comedy-adventure film set in 1920s London. The story revolves around a group of intrepid nannies who accidentally become involved in international espionage when they steal a dinosaur skeleton from the Natural History Museum. The nannies believe the dinosaur contains a secret microfilm that holds critical information, while a group of Chinese spies, led by the nefarious Hnup Wan, are also on the trail of the same microfilm. Chaos ensues as the nannies, led by the determined Hettie, go to extraordinary lengths to hide the enormous dinosaur skeleton from the spies, leading to a series of comedic misadventures through the streets of London. Eventually, the true location of the microfilm is revealed, and the nannies manage to outsmart the spies, returning the dinosaur to the museum and saving the day.

Lord Southmere escapes from China with a microfilm of the formula for the mysterious "Lotus X", and is captured by Chinese spies who have been instructed to retrieve the microfilm from him. Escaping from his captors, Lord Southmere hides the microfilm in the bones of a large dinosaur at the National History Museum. However, he has been followed into the museum by the spies, so Lord Southmere asks Hettie (his former nanny), to retrieve the microfilm before the spies can find it. He is then promptly recaptured by the head spy, Hnup Wan. Hettie, and her friend Emily (another nanny), devise a plan for a group of nannies to search for the microfilm, but they are unsuccessful in their endeavors. The spies then decide to steal the dinosaur, but are outmaneuvered by Hettie and Emily, who, with a young nanny named Susan, take the dinosaur skeleton on an unforgettable journey around the countryside. When Hettie's two young charges, Lord Castleberry and his younger brother, Truscott, also become involved in the plot, all seems lost, especially for Lord Southmere.—David McAnally <[email protected]>