Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: suspenseful and well written

I really enjoyed this book when I read it several years ago. I'll admit that the topic had special interest to me because I'm interested in all of caves, New Mexico, mining, geology, and prehistoric things; all of which are woven into the story line, and I think the author did a fine job of crafting this mystery novel in that setting. While I'm at it, I'll put in a plug for all of Jake Page's novels--he's one of my favorite authors, so try some of his other books too, you won't be disappointed (you'll enjoy getting to know the protagonist in most of his other novels, Mo Bowdre!).