Cobb, a skilled thief who commits corporate espionage by infiltrating the subconscious of his targets is offered a chance to regain his old life as payment for a task considered to be impossible: "inception", the implantation of another person's idea into a target's subconscious.

Champion competitive marksman Ken comes across an armored van robbery. He sees a policeman held hostage and shoots and kills four of the robbers. One of the robbers escapes and the policeman survives. The case is handled by Jerry Chang, whom Ken knows from having recently beaten him in a shooting match. Ken is found not guilty in court. Soon after, Ken is attacked by the escaped robber Pang Tao. Their confrontation reveals a very different background story and brings about a myriad of lies and traps and changes in relationships as Jerry and Ken try to outsmart each other.