"Retired covert operative Czerny Clark has sworn off the black ops world — until his former partner disappears" and he gets pulled in from retirement to fix a situation that not one single other person out of seven billion on the planet can possibly resolve. And how many times has this exact plot been retreaded? Barf. Just title it "Body Count" - all these novels are exactly the same - why not employ the same generic title - pulled out of retirement each time a "new" story appears?!
AND
Blueblood by Matthew Iden
"With a deadly cop killer on the loose, former homicide detective Marty Singer must come out of retirement to chase down the culprit" Why? Is every other cop incompetent? As I've pointed out many times before: this trope is way the hell overdone!