Detective James Knight 's last-minute assignment to the Independence Day shift turns into a race to stop an unbalanced ambulance EMT from imperiling the city's festivities. The misguided vigilante, playing cop with a stolen gun and uniform, has a bank vault full of reasons to put on his own fireworks show... one that will strike dangerously close to Knight's home. 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.