In James Bond movies, one of the many ways of ratcheting up the tension is to introduce a Bad Thing About to Happen in, say, five minutes’ time, and to regularly return to the flashing digital countdown amid the action to see how much time is left before the Bad Thing transpires. Author Taylor Adams updates this suspense-building device in his supercharged novel No Exit with a dwindling cellphone battery peppering the high-tension text. The scene: a lonely snowbound rest area in rural Colorado, a place with little to no cellphone service, and a protagonist who has left her charger at home on what will prove to be the worst night of her life. At risk are a kidnapped child, albeit a rather resourceful one; a pair of innocent (or maybe not) bystanders; and the aforementioned protagonist, a college student named Darby Thorne, who was en route to her mother’s hospital bedside before her plans were interrupted by the freakish snowstorm and an even more freakish group of fellow strandees at the mountain shelter. Oh, and one last thing, and it really is the last thing—the twist ending is way cool.