Jessamine Goodfellow has spent six Seasons avoiding the parson’s trap, and spinsterhood is finally within her grasp. A brilliant scholar, she longs for adventure and new experiences, things her family frowns upon. Presented with the opportunity to use her puzzle-solving talent on a secret mission for the Foreign Office, Jess eagerly accepts. Even when it means posing as the wife of a scorchingly attractive Scotsman who she must also covertly investigate as a possible double agent.

Lord Dougal MacNair, the new Viscount Fallin, has always completed his assignments for the Foreign Office alone. Now he’s saddled with an overly enthusiastic amateur partner. She possesses a remarkable intellect, but something about her isn’t quite right, and after two failed missions, Dougal is certain someone is working against him. Battling their secret suspicions, Dougal and Jess dive deep into their cover as a married couple, which arouses temptations they find irresistible. Danger is all around them, but it’s their hearts that may be the most imperiled.