At the height of WWII, five idealistic young Americans receive a mysterious letter from the OSS, asking them if they are willing to fight for their country. The men and women from very different backgrounds - a Texan athlete with German roots, an upper-crust son of a French mother and a wealthy businessman, a dirt-poor Midwestern fly fisherman, an orphaned fashion designer, and a ravishingly beautiful female fencer - all answer the call of duty, but each for a secret reason of his or her own. They bond immediately, in a group code-named Dragonfly. 

Soon after their training, they are dropped behind enemy lines and take up their false identities, isolated from one another except for a secret drop-box, but in close contact with the powerful Nazi elite who have Paris under siege.

Thus begins a dramatic and riveting cat-and-mouse game, as the young Americans seek to stay under the radar until a fatal misstep leads to the capture and the firing-squad execution of one of their team. But...is everything as it seems, or is this one more elaborate act of spycraft?