It isn't easy making a living as a lady's companion when one possesses a sharp tongue and an original mind. That's why Emma Greyson has gone through three such positions in six months. Her current post at a tiresome country house party has her bored to tears -- until an extraordinary encounter with the legendary Edison Stokes leads to a secret position as his assistant. Stokes is on a peculiar mission, searching for an anonymous thief who has stolen an ancient book of arcane potions. He suspects his quarry is among the party's guests -- and that the villain is looking for an intuitive woman on whom to test a certain elixir. A woman just like Emma. For Emma, the new post brings unexpected passion and chilling danger. But when murder strikes, she realizes the awful truth. Unless she and Edison devise a scheme to outwit a merciless killer, she could forever lose the man of her dreams -- and even her very life.