I read the last hundred pages in one sitting in a car park rather than go inside, which is all you need to know.
King in late career writing at something close to his best. Holly Gibney has been one of my favourite Stephen King characters since Mr Mercedes and this is her book in a way the earlier appearances were not. The antagonists are genuinely unsettling in a way that feels specifically contemporary. The pacing is King's — long, patient, then suddenly very fast — and it works.