Who is Monica Tyler from The Mark of the Assassin: A Novel and what is their importance?

Director of the CIA counter-terrorism unit at Langley, Monica Tyler is Michael Osbourne's ultimate boss. She has not been particularly pleased with Michael in general but is furious when he refuses to return from his search for "October" when directed to do so. She places Michael on administrative leave as a consequence. Once the reader discovers that she is involved in an affair with Mitchell Elliott, one must wonder how involved she is in the activities of both Elliott and the Society. She emerges unscathed in the end, leaving the reader a bit disappointed.