So, having gotten that out of the way, let's set the subtitle aside and turn to the meat of the story, which covers Deane's involvement with Beaumarchais in order to provide much-needed funding and supplies to the American war effort. As an account of the fascinating diplomatic tangles the American commissioners (Deane, Arthur Lee, and Franklin) worked themselves into as they sought to ally the rebellious American colonies with France while fighting amongst themselves and attempting (entirely unsuccessfully) to avoid British spying, Unlikely Allies works. Paul ably recounts the rivalries between the commissioners (which ultimately led to Deane's recall by Congress) and the British infiltration of their mission (several of the secretaries were spies, including Dr. Edward Bancroft), bringing a good sense of drama to the complicated diplomatic and political wranglings which ultimately resulted in the alliance.
A few minor typographical and other errors mar the text, which otherwise (setting aside the awkward inclusion of the d'Eon sections) is very readable and captivating. The notes are not indicated in the text (and certain statements I wanted citations for didn't have them), but at least the bibliography is extensive.
Generally, an interesting look at an important and convoluted episode of Revolutionary history.