It's Nanny Hettie to the rescue when British Intelligence Agent Lord Southmere is captured by Chinese agent Hnup Wan. Hettie is the only one who knows Southmere's secret: he has stolen a piece of top-secret microfilm from a Chinese warlord and hidden it in the skeleton of a dinosaur in a London museum. Aided by a small army of fellow nannies, Hettie saves the day by foiling Wan and his gang.