Don and the team investigate a suspicious death at a horse track. When Charlie starts looking into the crime, he uncovers something that will send the investigation into an entirely different direction.
Blackouts all over Los Angeles leave the city in the dark. Don works with his team to figure out if the power outages are an accident or the work of terrorists.
Charlie's investigation of a company's toxic paving material is impeded by a new school administrator who wants him to focus primarily on his pure academic work instead.
The assassination of a California senator leads the team to questionable experimentation on prisoners, the CIA, and a man bent on revenge. Elsewhere, Larry makes an announcement that shakes Charlie.
Multiple robberies at upscale restaurants bring Don's team in once it escalates to murder. Elsewhere, both Charlie and Don must do some soul searching as one tackles a psychiatric review and another questions the ethics of a pharmaceutical company that wants to use his name.
The discovery of a presumed dead police officer's badge brings the LAPD and Don's team together to solve the mystery of what happened 17 years ago. Elsewhere, Alan is served in a lawsuit, and he has to determine if his calculations were wrong when he consulted for a golf course.
One of David's childhood friends is accused of murder while sparring in preparation for an All-Out Fighting bout, and Charlie has a contest of his own trying to defend Larry's chair in a Texas Hold 'em qualifier.
The son of a multi-millionaire Latino hip-hop-Song producer is kidnapped. The kidnapper demands $3.2 million for the boy's release, but Granger and his crew only have one hour.
An old colleague of Charlie's asks for help because of the untimely deaths of some coworkers, but when she also turns up dead Don and Charlie are started on a trail that may threaten the very democracy they've vowed to protect.
As letter bombs begin targeting people surrounding a previous serial bomber investigation, Don and Charlie must sift through a number of false leads to find the real killer.
A shipment of medicine and cash bound for Zambia is hijacked, and Don and his team find themselves working against a banker focused on retrieving his money at the cost of the people being held for the code to access the safe.
When Charlie and Don are specifically asked for by a bomber who's rigged a bridge, it puts them on a trail of espionage in- and outside the states, and a devastating betrayal.
