The family of a deceased congressman accidentally discovered one of his relics - an 8mm film, which showed the whole process of a girl being tortured and killed. So they handed it to a private detective Tom Wheeler (Nicolas Cage) to investigate the truth. Tom Wheeler's originally peaceful life began to be full of dangers. The process of Tom Wheeler's step-by-step cracking of the truth was also the process of falling into a quagmire. However, the tragedy of the abuse of the strange woman in the film lingered in his mind. Conscience prompted him to become fearless in the face of the dangerous truth. But when the truth was revealed, the ugliness of the world was so unbearable that Tom Wheeler also fell into horror...