I ran across this list on twitter this morning.
There are many YA and thriller, and fantasy ebooks for free today. You can see the list here.
Just FYI, I’ve begun reading Carolyn Arnold‘s Ties That Bind, after buying it off of just one of her tweets. 😉 I have to say, I think thriller fans will enjoy it. So, yes, that’d be my recommendation from the list. I hope you find something there to enjoy!