Crow Killer - Raymond Thorp & Robert Bunker. Based on history, but there is some argument as to just how accurate it is, but it's a good read either way.
The "Earth's Children" series - Jean M. Auel. The 1st book in this series is Clan Of The Cave Bear.
One Second After - William Forstchen. Fiction, but the premise is entirely possible, even probable.
"The Dresden Files" - Jim Butcher. The 1st book in the series is Storm Front. Sort of Harry Potter meets the Rockford Files. The books keep getting better & better. Action, mystery, fantasy & some humor all rolled into this series.
+ 1 on anything by Patrick F McManus, you'll laugh so hard it hurts!
The "Spellsinger" series - Alan Dean Foster. An interesting & humorous spin on fantasy. 1st book in the series is Spellsinger.
The Long, Loud Silence - Wilson Tucker. A very good post-apocalyptic survival story.
The "Amber" series - Roger Zelazny. 1st book is Nine Princes In Amber. This is an excellent fantasy series, not like any other.
Regards, GF.