Meet Tessa Kilpatrick: heiress and World War One covert operations agent.
Finding her husband – the feckless James – with another woman at a country house party, Tessa demands a divorce. But when his body is discovered in a lonely stone bothy the next morning, Inspector Hamish Rasmussen sees her as his only suspect.
Back in Edinburgh, links to another murder convince Rasmussen of her innocence. He enlists her help and together they set off on a pursuit that will bring Tessa once again face to face with the brutality of war as well as revealing to her the lengths that desperate people will go to in order to protect those they love.
Will Tessa be able to prevent a final murder or will she become the killer’s latest victim?