After losing her husband to a rogue French agent, Charlotte Moncrieffe wants to make her mark in international espionage. And what could be better for recovering secret long-lost documents from the Palais Garnier than her stealth dirigible, Gossamer Wing? Her spymaster father has one condition: He won't send her to Paris without an ironclad cover.

Dexter Hardison prefers inventing to politics, but his title as Makesmith Baron and his formidable skills make him an ideal husband-imposter for Charlotte. And the unorthodox undercover arrangement would help him in his own field of discovery.

But from Charlotte and Dexter's marriage of convenience comes a distraction--a passion that complicates an increasingly dangerous mission. For Charlotte, however, the thought of losing Dexter also opens her heart to a thrilling new future of love and adventure.