Being a cop runs in Billy Harney's family. The son of Chicago's Chief of Detectives whose twin sister, Patty, also followed in their father's footsteps, there's nothing Billy won't give up for the job, including his life. Left for dead alongside his tempestuous former partner and a hard-charging assistant district attorney out for blood, Billy miraculously survives. But he remembers nothing about the events leading up to the shootout.