15 Seconds is a revenge story -- in reverse. Here, the good guy is receiving and the bad guy is delivering the revenge, gruesome revenge. What makes the story work so well is the compassion you may feel for the killer, as twisted as he is.
Authors often like to talk about finding their literary voices, which generally means they haven't sold anything yet. This post, however is about writers who actually have sold a book, want to voice the audiobook edition -- and shouldn't.