Summer 1781. Passy, France.

Rebecca Parcell is eager to reach Paris to marry Daniel Alloway, who's gone ahead to take up a new post there. But their idyllic prenuptial life unravels when they accept an invitation to reside with Dr. Benjamin Franklin, America's brilliant, enigmatic ambassador to France.

A murdered man is found on the roof of Dr. Franklin's home outside of Paris, and he calls upon his two new houseguests–former spies for George Washington–to investigate. Becca and Daniel find themselves searching for the murderer through the labyrinth of 18th-century Paris, a city brimming with danger, secrets, and the ever-present whispers of revolution.

With time running out, Becca and Daniel must determine whether the killer is a member of Dr. Franklin's inner circle or a cunning outsider. And as the couple race from the cobblestone streets of Paris to the gilded halls of Versailles, they discover that their own lives are in grave danger and that the stakes for Dr. Franklin and America are even higher than they could have imagined.

Will Becca and Daniel find the killer before the murderer strikes again, and will they ever manage to marry?