Mysterious events in a gloomy old house lead three teenagers, Peter, Bill and Charlotte into adventure... and perhaps danger.
Sound advice for the teenagers as they embark on a search that leads them to Buckingham Palace, St. Jame's Park, Westminter Abbey and the Imperial War Museum. Their only lead: an empty wallet and a strange telephone call they overheard...
Charlotte is pursued through Kew Gardens by 'Scarface'. She escapes with the boys on a London Transport Routemaster bus, where they wrongly believe that they are safe...
Our three young heroes find themselves visiting the Cutty Sark at Greenwich, the Victoria and Albert Musuem, and the Wellington Museum (postal address: 'No. 1, London').
Bill has been caught by 'Uncle Gerry' during his hunt with Peter and Charolotte for the 'Tyrant King'. Certain clues lead the youngsters to the famous but eerie caves at Chislehurst, in Kent.
Peter has an idea: they need to try the Natural History Museum. They only have three hours to solve the mystery while the clocks tick.