Detective James Knight's last-minute assignment to the Independence Day shift turns into a race against time to stop an unbalanced EMT worker who's posing as a cop.Detective James Knight's last-minute assignment to the Independence Day shift turns into a race against time to stop an unbalanced EMT worker who's posing as a cop.Detective James Knight's last-minute assignment to the Independence Day shift turns into a race against time to stop an unbalanced EMT worker who's posing as a cop.