A hoot of a Disney caper starring Derek Nimmo as British agent Lord Southmere, who conceals a top-secret microfilm containing a secret formula in a dinosaur skeleton at London's Natural History Museum. However, he's only just ahead of a pursuing Chinese gang. When he realises they're onto him, he instructs his resourceful former nanny Hettie (Helen Hayes) to retrieve the film... just before he's grabbed by the head spy, Hnup Wan (Peter Ustinov). Meanwhile. Hettie assembles a group of fellow nannies and they set off with the skeleton in tow on a wild trip around the country.