In this 1880s world of steampunk and gears, Henry David works as a tailor and an inventor, though most of his inventions are disasters. Sophie Thomas is a brilliant spy, without Henry’s knowledge, she uses him to root out enemy agents. He senses she has feelings for him, but it is hard to know if her love is genuine or she is merely playing an elaborate game.
He inadvertently creates a duplicate of her, this has an adverse effect on their friendship. Will she ever forgive him for his bumbling? She doesn’t seem to be the long-suffering inventor’s wife he had hoped for. She, on the other hand, feels he thinks too much of their relationship.
When enemy agents kidnap her, it is Henry who holds the key to her fate. In the end, Henry must choose between rescuing Sophie or destroying the enemy’s super weapon, thus ending the war.