I loved the previous 3 Mason Sharpe stories on audiobook. This story however, not so much.
SOME SPOILERS AT THE END
I would in fact give it a half a star lower (say 3.5) due to the narrator's constant need to overly stress every 'K' and 'T' sound at ends of words like 'thinKKK' and 'poinTTT'
That might be picky but on to the story...
The whole premise of the conflict, threats, car chases, assaults and murders is strung along very very slowly with detailed descriptions and eventually revealed as though it were some sort of complex, unique situation.
Young, fit, beautiful women flirting with and leading on older, successful (ideally married) men with the end result being to blackmail them with compromising photos. Oh and one of the girls took a crap load of money from the mob in one such 'honeytrap'. After about 45 minutes or so into the story when the dude in love has his bank account emptied, I was thinking...'this had better not be what it looks like...' because there was still another 5 hours or so to verify this!
Not to mention the Rambo-like body count of bad guys even after 2-3 direct head shots with a baseball bat.