There are a number of comic books from DC Comics in today's top 100 free list if such things interest you. I did not list any of them.
From the top 100 free list
Russian Roulette (Dev Haskell - Private Investigator: Case 1)
Start the Dev Haskell - Private Investigator Series with Case 1: Russian Roulette!
Beaten, shot, car bombed, and as if things couldn't get any worse, used as a human shield!
Dev Haskell, Private Investigator, just woke up next to his client without the foggiest notion she's signed him up with the Russian mob.
Why is Dev going through all this?
Love, of course. Well, at least that's what he's telling himself and their 'special' relationship quickly places him at odds with the FBI task force investigating human trafficking. On the hunt for answers,Dev finds himself with a foot on both sides of the law.
[#3 - been free before. I have not read it.]
Find Virgil (A Novel of Revenge)
Second-hand smoke gave Martin Muntor lung cancer...and he's mad. Very mad.
And he's going to do something about it.
It's 1995, and the tobacco industry thinks it's invincible. But is it? Muntor devises an ingenious strategy to put Big Tobacco out of business, and he doesn't care how many people he has to take with him in order to do it.
Cigarette company investigator Tommy Rhoads has other ideas, though. Who's right, and who's wrong? Read Find Virgil now, and go along for the wild ride. You'll never forget it.
[#20 - a bit more than a bit far fetched maybe, but if you like this style of thriller you might like it.]
Free From Stackpole.
Stackpole puts a book or two up for free periodically, lately every couple of days. I have read several of their free books. Some interesting stuff. Most of what I have seen is WWII German military history, with varying quality of translation, some other military history from lesser known units, along with some fishing and other outdoors oriented books.
Grouse Hunter's Guide: 2nd Edition, Solid Facts, Insights, and Observations on How to Hunt Ruffled Grouse
Revised edition cites up-to-date statistics reflecting the trends among grouse hunters
Includes a chapter of grouse recipes
Dennis Walrod takes beginning and experienced grouse hunters alike through an examination of key aspects of the hunt: how to get the most out of a covert, choosing guns and dogs, as well as concerns particular to autumn stalking or winter hunting. The emphasis falls on grouse hunting as a sport pursued for the thrill of the hunt, the adrenaline shot brought by the force of a flush, rather than the quest for impressive numbers.