Dark Desires After Dusk by Kresley Cole

Britt's take

Fast, fun, and genuinely tense — a standalone in the IAD series with a moral dilemma that keeps the stakes real. Holly and Cade are oil and water, and the chemistry and conflict build relentlessly. This is darker than most IAD books — stalking, manipulation, kidnapping, none of it softened. This is dark romance, not dark-adjacent. Know that going in, and if you're on board, it delivers. Published 2008.