When shots ring out in a crowded L.A. club, bartender Harper Flynn watches helplessly as her boyfriend, Drew, is gunned down. A year later, Harper is trying to rebuild her life. The investigation into the shootout has been closed. The two gunmen are dead. But Harper is sure that a third gunman escaped. With the help of former sheriff's deputy Aiden Garrison, who was injured in the shootout, she sets out to prove the gunman's existence. A fast-paced thrill ride from the author of The Shadow Tracer (2013).