The hero is Aidan, who sees demons. Orphaned, he strives to protect his younger sister Ava who is in a foster setting while he lives on the street. It turns out his abilities are significant and the usual mayhem ensues.
I don't read much of the para-normal genre, but it seems to me unusual to find a lead character burnishing a Star of David to ward off a demon. So that was pretty cool.
There were some annoying aspects of the book, but overall it was quite interesting - enough so that I do intend to read the sequel, even if I can't get it for free.
Darkness Brutal (The Dark Cycle Book 1)