When Casey Duncan first arrived at the off-the-grid town of Rockton, an isolated community built as a haven for people running from their pasts, she had no idea what to expect -- with no cell phones, no internet, no mail, and no way of getting in or out without the town council's approval. She certainly didn't expect to be the homicide detective on two cases, or to begin a romantic relationship with her boss. But the very last thing she expected was for the town council to drop a dangerous criminal into their midst without a plan to keep him imprisoned -- and to keep others safe.