Interestingly, this isn't the only project in the works based on Circle of Treason. In October Deadline reported that the screen rights to the book (evidently separate from the television rights) had been acquired by Focus Features. While the trade blog (oddly) didn't mention The Assets in its story, it did offer a nice summary of the movie's approach to the story:
The movie is a dramatic thriller based on real events in the late 1980s and early ’90s in which sounds like Zero Dark Thirty-like dogged hunt for a CIA traitor. The authors methodically took down America’s most notorious traitor, and had to battle against the CIA’s institutional hierarchy and chauvinism to do it. Vertefeuille, who passed away, rose in the CIA from the position of typist to taking foreign postings in places like Ethiopia, Finland the The Hague before working in counterintelligence. That’s where she met Grimes.Barry Josephson is producing, Adam Schneider is co-producing, and Anne Waterhouse and Joe Shrapnel are writing the script. Personally, I'm eager to see both versions of this deadly real-life mole hunt! If the film version is anywhere near as good as Billy Ray's Breach (which told the story Ames' equally damaging contemporary mole in the FBI, Robert Hanssen), then it will really be something to look forward to.
After seeing how a coterie of agents and assets — some they knew personally — were assassinated or imprisoned in the Soviet Union, they became convinced there was a mole in their midst. The movie is the methodical hunt that brought down Ames, who received millions of dollars for his treachery and nearly got out of the country before he was caught.