<b>From the back cover of the Tor UK first edition:</b> "Ex-spy Belle Boyd is retired - more or less. Retired from spying on the Confederacy, anyway. Her short-lived marriage to a Union navy boy cast suspicions on those Southern loyalties. So now in her mid-forties, she finds herself unemployed, widowed and disgraced. That's until a life-changing job offer from the staunchly Unionist Pinkerton Detective Agency.
<p>When she'e required to assist Abraham Lincoln himself, she has to put and old loyalties firmly aside - as she spied against him twenty years ago. Lincoln's friend Gideon Bardsley, colleague and ex-slave, has been targeted for assassination after the young inventor made a breakthrough. Bardsley's calculating engine, Fiddlehead, has proved that the world is facing an extraordinary threat. Meaning it's not the time for civil war.
<p>Now Bardsley and his remarkable machine are in great danger as forces conspire to keep this potentially unifying secret. For some want to keep the war moving and the money flowing. With spies from both camps gunning for her, can even the notorious Belle Boyd hold the war-hawks at bay?"
