It stars Alex Karzis as Chester Lamb and Dolph Lundgren as Sam Decker, a high school teacher who is about to retire and has one more detention to proctor.

Sam, on the other hand, must unite the troublemakers and outcasts in detention to defeat the criminals and survive because the drug runners have chosen to attack the school.

However, Hamilton High is about to become a very real battlefield when a well-organized group of murderers with automatic weapons and explosives invades the school after hours to hide $300 million worth of heroin that they have hijacked.

The invaders, led by brilliant but cruel Chester Lamb, are surprised to find that Sam and the kids from the detention room are still inside the school.

Gloria Waylon (Kata Dobó), the punks Viktor (Joseph Scoren), and Alek (Anthony J. Mifsud), all members of Lamb's crew, continue to stalk the students throughout the school.