**Detective Meg Thorne, haunted by the years of cold cases she could not solve, retires early, in her 50s, feeling stifled by the limits of the law and determined to do whatever she has to to solve them on her own, stop these killers, and rescue any victims. Outside of the red tape, she will be free to cross all lines, and do whatever must be done—as long as she doesn’t find herself, alone, in a killer’s sights…**
When the signature markings of the “Underground Killer” resurface in Boston’s depths, Meg Thorne delves into the shadows of the past to uncover a truth buried for decades. With a suspect long dead and justice unserved, Meg must outwit a potential copycat—or expose the deadliest of secrets that could shatter everything she knows.