"After years of excuses, Tess has finally agreed to go caving with her best friend Allie. Their lives have diverged sharply since high school--Allie is a self-made travel influencer, while Tess is a shy (and claustrophobic) legal assistant struggling to pay for law school. Maybe she's a little jealous of Allie's globe-trotting life. Who wouldn't be? As Tess and Allie descend into the depths, they realize they're not alone. A stranger who claims to be a fellow caver harasses them. Confident, take-no-shit Allie insults the guy--and he retaliates. Soon, Tess is trapped inside a narrow crawl space hundreds of feet underground, fighting to stay alive"-- Provided by publisher.