Lethal People, by John Locke

This purported spy / mystery novel is the modern day equivalent of pulp fiction.  Or perhaps of a comic book (for those who remember the days prior to the phrase "graphic novel").

The hero is a former CIA assassin who makes a living now as a killer for hire with no scruples what soever aided and abetted by government agencies who cover up his gaffes in return for the occasional (illegal, probably immoral) jobs for them on the side.

If you can get past the cliched portrait of the hero, and past the implausibility (one would only hope!) of the plot, it is an interesting read.