一顆名鑽失蹤、一位退休大盜、四個前科弟子,還有一個滿是猴子的迷宮──Montgomery Bonbon遇上史上最瘋狂的懸案!受邀造訪艾德斯通莊園,Bonnie與夥伴們陷入一場謎團交錯的奇案。當誠實的管家慘遭殺害,兇手與竊賊是否是同一人?"Brilliant, hilarious shenanigans, and lots of them. Montgomery Bonbon is on the case in their most bonkers adventure yet." Thomas TaylorBonnie Montgomery (as her case-cracking alter-ego Montgomery Bonbon) has been invited to Adderstone Manor by Fergus Croke, whose prized diamond has gone missing. Croke is a retired master thief who suspects one of his four protégés of the dirty deed – but when everyone is a crook, how does even the great Bonbon know where to begin?The plot thickens faster than a good roux when the only unsuspicious member of the household, Croke’s loyal butler, is found dead in the grounds – and it’s not long before Bonbon uncovers hidden identities, motives a-many, and a rather surprising hedge maze full of monkeys. Can Bonbon, Dana and Grampa Banks uncover the missing gem and catch the thief and killer – and are they one and the same?