I haven't finished reading this one yet, but had to put out a couple observations. Vince Flynn is very consistent. Consent to Kill is yet another page-turner in the Mitch Rapp series. It's also the first real sequel that I can remember of the series.
A Saudi billionaire puts a price on Rapp's head after Rapp kills his son during the events of Memorial Day. On the home front, Rapp and crew have to deal with the newly created office of Director of National Intelligence, and Anna Riley (Rapp's wife) announces she's pregnant. Lots of the old characters are back: Mitch, Anna, Irene Kennedy, Scott Coleman, the President, etc. And some interesting new ones are added including the team of assassins sent to kill Rapp.
There's one stylistic thing I noticed about Flynn's writing that I hadn't picked up on before (that is if he did it in previous books). In a scene between character A and character B (happens with multiple characters in multiple scenes), he describes what character B is wearing. The next time we see character B, he describes again what the character is wearing. It's kind of the opposite of some writers who only describe characters when absolutely necessary. We always know what Flynn's characters are wearing!