The Destroyer Series, about Remo Wlliams, Chiun, and the martial art known as Sinanju. They even made a movie and a tv pilot.

They are absolutely horrible. They give you nothing of value, not even education. They were mostly written by two authors who grew to despise each other,

They take a couple of hours to read, maybe a little more. They are the pinnacle of pointless time wasting. I read most of them while in the service.

They are perfect in every way.

I'm not sure I'd still recommend them now, but when I read them many, many years ago I really enjoyed David Morrell's [1] novels about highly trained assassins. They had titles of the form The $GROUP_OF_PEOPLE of the $THING: The Brotherhood of the Rose, The Fraternity of the Stone, The Covenant of the Flame, The League of Night and Fog (and maybe a few others whose titles didn't match that pattern, I think Testament was about the same characters, but can'lt really remember).

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[1] David Morrell is probably best known for First Blood, the novel Rambo is based on.

Ready Player One is probably the peak of this genre