To help capture a serial rapist-turned-killer, FBI Special Agent Don Eppes recruits his genius brother Charlie, who uses a mathematical equation to identify the killer's point of origin by working back from the crime scene locations.
Various people in the Los Angeles area with seemingly nothing in common become extremely sick and die on the same day, and Don fears bioterrorists may have released a deadly virus into the environment. While he tries to discover whether anyone is behind the outbreak, Charlie tries to locate the point of origin.moreless
After an engineering student at CalSci is found dead from an apparent suicide, Charlie convinces Don to launch an investigation after he reads the student's thesis which asserted that the architecturally magnificent Cole Center in Los Angeles is structurally unstable. Although reluctant at first, Don and his team discover that the student's findings were correct and uncover a dangerous and surprising conspiracy. Meanwhile, Alan prepares for a first date and convinces Don and Terry to join them, hoping they might rekindle their old romance.moreless
When a five-year-old girl is kidnapped from her birthday party, Don and Terry lead the investigation. They must, however, rely on Charlie's help because the girl's father Ethan is also a mathematician. Charlie realizes the kidnapper's motive when Ethan reveals he is close to solving Riemann's Hypothesis, a difficult math problem. If solved, the solution could not only earn him $1 million, but could break the code for Internet security and unlock the world's biggest financial secret.moreless
While consulting with the NTSB at the scene of a wreck, Don learns that this tragedy is one of a series of recreated accidents involving railroad negligence. As is the pattern with the previous train wrecks, an undecipherable numerical code is left at the site, which Don recruits Charlie to solve. Don's investigation leads him and his team to a dangerous standoff with their suspect, who has surprising ties to the railway system.moreless
Don learns that counterfeiters are at work producing small-denomination bills, and they have taken an artist hostage to draw the images for the fake money. If the missing woman isn't located soon, Don fears she will be killed when her work is finished on the phony cash. The counterfeiters have already murdered at least five people, two of whom stole money from them. The case is made more difficult for Don when his former lover, now a Secret Service agent, is assigned to it.moreless
A man wanted for stock fraud is found garroted in his apartment, and the crime is eerily similar to a murder committed a year earlier; a case Don closed when an ex-con confessed. Now, Don must re-investigate the old case to determine if he put an innocent man in jail. He asks Charlie to go over the evidence to see if he missed anything the first time around.moreless
The city is in a panic as a sniper goes on a shooting spree and randomly kills several people, including a postal worker. The investigation reveals that more than one shooter is at work. As Charlie works the case, he's frustrated by a sniper expert Don brings in to assist him.moreless