George and her new friend Timmy the Dog are joined for the holidays by her cousins Julian, Dick and Anne. The Five set out to investigate a long-ago...

The theft of a priceless new code machine by enemy agents sends the Five on an eventful train journey up to Scotland.

The Five reunite at a hotel on Cragstone Ridge, where old foe Thomas Wentworth seeks their help. He has foreseen the murder of visiting jazz singer...