After losing his job as a tow truck driver, Bradley Thomas, a stoic and burly man with a cross tattoo on the back of his head, descends into the criminal underworld to provide for his wife, Lauren. The couple's strained marriage faces additional stress from past mistakes and the unwelcome news of Lauren's pregnancy. Despite the circumstances, Bradley commits to turning over a new leaf for the sake of his future child. However, his decision to work as a drug courier leads to a high-stakes situation that rapidly spirals out of control. A failed pick-up results in a shoot-out with the police, and Bradley is subsequently arrested and incarcerated, prepared to weather his sentence quietly.

While in prison, Bradley learns that his enemies are holding his wife hostage and threatening to harm her and their unborn child unless he complies with their demands. To protect his family, Bradley has to navigate the violent and corrupt prison system, where every decision could be the difference between life and death. As Bradley is compelled to perform increasingly brutal acts to fulfill the kidnappers' wishes, he proves to be a formidable force. His journey takes him deeper into the bowels of the penitentiary, towards the infamous Cell Block 99, where he must confront the worst that the prison has to offer.