Margaret Harkness and Arthur Conan Doyle

Physician Arthur Conan Doyle takes a break from his practice to assist London police in tracking down Jack the Ripper in this debut novel and series starter. September 1888. A twenty-nine-year-old Arthur Conan Doyle practices medicine by day and writes at night. His first Sherlock Holmes story, A Study in Scarlet, although gaining critical and popular success, has only netted him twenty-five pounds. Embittered by the experience, he vows never to write another "crime story." Then a messenger arrives with a mysterious summons from former Prime Minister William Gladstone, asking him to come to London immediately. Once there, he is offered one month's employment to assist the Metropolitan Police as a "consultant" in their hunt for the serial killer soon to be known as Jack the Ripper. Doyle agrees on the stipulation his old professor of surgery, Professor Joseph Bell--Doyle's inspiration for Sherlock Holmes--agrees to work with him. Bell agrees, and soon the two are joined by Miss Margaret Harkness, an author residing in the East End who knows how to use a Derringer and serves as their guide and companion. Pursuing leads through the dank alleys and courtyards of Whitechapel, they come upon the body of a savagely murdered fifth victim. Soon it becomes clear that the hunters have become the hunted when a knife-wielding figure approaches.

Spring, 1897. London. Margaret Harkness, now in her early forties, must leave England for her health but lacks the funds. A letter arrives from her old friend Professor Bell, her old comrade in the hunt for Jack the Ripper and the real-life inspiration for Sherlock Homes. Bell invites her to join him in Germany on a mysterious mission for the German government involving the loss of state secrets to Anarchists. The resolution of this commission leads to her being stalked through the streets of London by a vengeful man armed with a powerful and nearly silent air rifle who has both Margaret and Queen Victoria in his sights. Margaret finds allies in Inspector James Ethington of Scotland Yard and his fifteen-year-old daughter, Elizabeth, who aspires to follow in Margaret's cross-dressing footsteps. The hunt is on, but who is the hunter, and who the hunted as the day approaches for the Queen's Diamond Jubilee when the aged empress will sit in her open carriage at the steps of St Paul's Cathedral? The entire British Empire holds its breath as the assassin, Margaret, and the Queen herself play for the highest of stakes with the Queen's Gambit.