★ 百萬暢銷童書推理名家 Robin Stevens 全新謎案，戰時英國、密碼破譯與聖誕懸疑交織登場！
★ 從女子學校到布萊切利園，三位孩子偵探闖入最高機密的殺人事件。
★ 適合喜歡《Murder Most Unladylike》、阿嘉莎・克莉絲蒂式推理與歷史懸疑的讀者。
1941年聖誕前夕，梅與努拉被送往神祕的布萊切利園，卻立刻捲入密碼破譯員之死。一張絕密訊息、疑似間諜的指控，以及被冤枉的 Bertie Wells，讓她們必須在戰時機密與重重謊言中破解真相。
'Robin Stevens is Agatha Christie for children' - Katherine Rundell
‘It's hard to know where to start. There's so much to say – about the murders, and the codes, and the spy, that I'm getting tangled up in the story already...'
It's December 1941, and almost Christmas, when a bomb falls on Deepdean School for Girls. May and Nuala are whisked away from the chaos and sent to stay with May's big sister, Hazel Wong, who is working at Bletchley Park.
Within seconds, they're thrown straight into their most dangerous case yet. A codebreaker has been shot in what appears to be a tragic accident - until a suspicious and top-secret message is discovered in his pocket. Was he a spy, working for the other side? Was the message planted on him? Most importantly - was this murder?
Worst of all, Daisy's big brother, Bertie Wells, is being blamed. It's up to May, Nuala and their friend Eric to prove Bertie's innocence and solve the mystery. But Bletchley is a strange and secretive place, full of Britain's most ingenious minds. They'll need to watch, listen, and puzzle out the incredible, unthinkable truth…
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