Oath of Loyalty by Kyle Mills is a continuation of Vince Flynn’s series of books featuring Mitch Rapp. This time, the CIA operative is in a tough spot: the President, Anthony Cook, is convinced he’s a threat. CIA Director Irene Kennedy offers a compromise that means that Rapp needs to stay out of the country, and out of the president’s way, to avoid prosecution. But, when one of Cook’s cabinet members, who has it out for Rapp, decides to leak the identity of Rapp’s partner, Claudia Gould, she is immediately thrown into danger. As Rapp commits himself to fighting against the enemies targeting her, he uncovers the threat of a mysterious killer known only as the Legion.