The bestselling author of Murder Most Unladylike returns with a thrilling mini-mystery. 'I, the Honourable Daisy Wells, have decided to report on another mystery that the Detective Society has encountered in recent weeks.' It was thrilling and heroic, and I was bright and fearless...' A daring thief has been plundering the most famous museums in London... Daisy and Hazel realise where they'll strike next as Daisy's birthday treasure search brings them into the path of the culprit - the British Museum! The girls must crack codes, untangle clues, and race against time to solve the mystery with the help of their friends (and adversaries), the Junior Pinkertons.