At thirty years old, Delilah Vale attends the Blackhaven assembly room ball for only one reason-to enjoy a symbolic final waltz before embracing spinsterhood and an independent career as a translator and secretary. Lord Linfield, distinguished diplomat, handsome, graceful, and charming, is the perfect partner. Unfortunately, Linfield is there for an entirely different reason-to reel in the traitor who is leading one of Britain’s allies to assassination. Neither expects to be quite so fascinated by the other. Or so mistaken.