THE BLUE DIAMOND

The year 1917 finds Joanna Holmes Watson in a battle of wits with thieves who’ve pinched the world’s second-biggest diamond and something even more valuable.

It’s bad enough that someone’s sneaked into the South African governor general’s suite at the Windsor Hotel and made off with a blue diamond of historic dimensions. What’s much worse is that the robbers, who seem to specialize in looting London penthouses, have also absconded with a military document that could decisively affect the course of the Great War. Inspector Lestrade, son of the inspector constantly one-upped by Sherlock Holmes a generation ago, brings Sir Charles Bradberry, the Scotland Yard commissioner himself, to Holmes’ daughter, Joanna, who’s married to Dr. John Watson Jr., to entreat her to take the case. Joanna quickly determines who the culprits were and how they gained access to the governor general’s rooms, but the thieves have already vanished, leaving Joanna, working with the Yard and Maj. Eric Von Ruden, the governor general’s security chief, to figure out where they’ve gone and how to recover the jewel and neutralize the loss of the stolen document. Soon enough the problem is deepened, for the thieves make the first of several murderous attacks on the Watsons, and it’s clear that their efforts to end their pursuit by the woman universally recognized as England’s greatest detective will only escalate. As usual in this series, the crime, though large-scale and historically urgent, is routine and the head conspirator, obvious. What shines, now as ever, are the razor-sharp observations of Sherlock Holmes’ daughter and the shrewdly logical inferences she draws from them time and again.

Detection triumphs over crime in every possible way.