The day the sun became the enemy, the lights went out for good. But for one family, a much darker conspiracy was already in motion. A catastrophic solar flare has plunged the world into a new dark age. Technology is a memory, and the infrastructure of modern life has crumbled overnight. In the small town of Thermopolis, Wyoming, Lisa Bentley and her family are fighting to survive in this brutal new reality. Their most desperate battle is for their daughter, Sophie, who lies trapped in a coma, completely vulnerable in a world without rules. But the darkness of the new world is nothing compared to the secrets the old one was hiding. Lisa’s sister, Seattle detective Anne Skidmore, knows the violent attack that left Sophie comatose was no accident. As she digs deeper into a case everyone else considers closed, she uncovers a chilling conspiracy that stretches from the mountains of Wyoming to the darkest corners of the globe—a network of predators who see the apocalypse not as an end, but as an opportunity. Now, with a ruthless new power rising from the ashes of their town and a shadowy enemy closing in, the Bentleys must forge new alliances and fight back. In a world where the biggest threat isn’t the disaster, but what people do in the aftermath. Can they protect the ones they love and uncover the truth before it’s buried forever? Survival by the Bighorn River is a post-apocalyptic thriller about resilience, justice, and the terrifying discovery that even when the world ends, the monsters don’t disappear. They try to take over.