An incredible team of bank robbers has hit 16 banks in only 8 months. Don has Charlie help, and he comes up with an equation to identify possible targets. However, the robbers, who had not been violent, turn on the FBI after being cornered and open fire on Don's team.
Charlie sees the news report about the shooting and takes off for the crime scene. Meanwhile, Don and Terry track one of the thieves into a warehouse, but the robber shoots Don and escapes.
Charlie feels guilty about not realizing the thieves would 'up the ante', and leaves the case, reverting to trying to solve the unsolvable math problem 'P vs. NP'. This is the same problem that he worked on the whole time his mom was dying of cancer.
Terry and Don figure out that one of the robbers had stolen the identity of a computer programmer. They realize that you would probably have to be military to do such a job, and start looking at Special Forces and highly trained military personnel. While looking, they find that two men had been accused of stealing payroll shipments.
Charlie finally talks to Alan about how his math consumed him during his mom's sickness, because he didn't want to face the truth. Alan tells him that his mom always understood that. Charlie realizes that the robbers are using information from one robbery to get information on their next targets.
After telling Don about it, the team finds out that the robbers had found information about a shipment of old bills being sent from the Federal Reserve. If stolen, they would make almost $100 million! The FBI sets up a sting and catch all of the robbers, including the leader.