The Blue Diamond by Leonard Goldberg
My rating: 4 of 5 stars

November 1917. After two robberies at hotels, the Blue Diamond is stolen from the hotel suite of the Governor-General of South Africa while staying at the Windsor Hotel. Joanna, daughter of Sherlock and the two doctor Watsons are brought in to investigate. But then secret war plans are stolen, and their lives are threatened. Can they all survive, find the guilty parties and retrieve all the stolen items.
An entertaining and well-written mystery with its likeable and interesting three main characters, especially the two Doctor Watsons. This is another good addition to the series which can easily be read as a standalone story.
An ARC was provided by the publisher via Netgalley in exchange for an honest review.

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