I, the Honourable Daisy Wells, have decided to give an account of another mystery the Detective Society has faced in recent weeks. It was very exciting, and very heroic, and I was very brilliant and brave . . .
A daring thief has been robbing London's most famous museums. When Daisy's birthday treasure hunt leads them right into the path of the culprit, Daisy and Hazel realise where they'll strike next - the Ancient Egyptian mummy room at the British Museum!
With help from their friends (and rivals), the Junior Pinkertons, the girls must crack codes, unravel clues and race against time to solve the mystery.