Misterio en la mansión (Montgomery 3)

Although she doesn't usually accept messenger jobs, this time Bonnie makes an exception, and in her secret identity as Montgomery Bonbon, she and her grandfather go to deliver a priceless diamond to a retired thief named Karl Dâhver. What a twist! Shortly after arriving at the mansion, Karl Dâhver is murdered… and all his apprentices, who were present, become suspects.