A sleepover on Friday night, best friends forever, popcorn and a good movie. What could go wrong? Rylee and Gray Flanders; Carsen and Cody Holloway, over at the Flanders' house expecting the usual Friday night fun. Joe Flanders is a local plastic surgeon, and his wife, Cyndi, is a former beauty queen. Cyndi is popping the corn when it happens. The flash. The fear. The shock. The bowel-shaking noise. Both sets of twins are 16 and now have to wonder if they will survive to 17. Making it across the street to the Holloway house where Gray and Carsen explain there is a room full of emergency supplies is the first challenge. After that, survival. Who knows how? Who even thought of this stuff? This wasn't supposed to happen.The Water Cave, Book 1 of This Wasn't Supposed to Happen, takes us on a journey of both survival and loss as two families and a small group of passers-by face the unthinkable together, sheltered from the nuclear horror until the day they can step outside and face the uncertain future.