By Rene Denfeld. James Daniel Nelson, also known as "Thantos," and his sway over a "street family" of mostly middle-class teens: it was, IIRC, a preoccupation of the Law & Order franchise back in the mid-aughts. I feel like at least two of the franchises and possibly all of them ripped from this headline, or one like it. I haven't read the Denfeld but the blurb makes the book very tempting.
The hardcover is in good shape -- no dog-ears, no writing, average shelfwear to the jacket (and a sticker on the spine) and toning to the pages. It does kind of sit as though there's something stuck in the back, but for a reading copy, it's fine.