Author is giving away Books 1 and 2 of his Green Ember series of books in a promotion for his 3rd book which is on Kickstarter. Normally 2.99 on Kindle, or free with Kindle Unlimited, but free for the next few days.
I haven't read the books, but they have good reviews. I have no connection to the Kickstarter; I'm not even a backer. Just passing along free Kindle ebooks.