Series 1 / Episode 3
Don relies on Charlie's mathematical insight to help stop a virus that has been killing innocent people in Los Angeles.
Series 3 / Episode 20
Don and Charlie hunt for a serial letter bomber, however they disagree with one another over whether a key suspect, who eluded conviction once before, is responsible for the latest murder.
Series 3 / Episode 21
A former mob hit man who is now on death row, agrees to cooperate in the investigations of several unsolved murders, however Don questions the man's motives.
Series 1 / Episode 4
Charlie convinces Don to investigate a student's suicide in order to make sure that it was not murder.
Series 1 / Episode 5
Don needs Charlie's help to find out why the daughter of a mathematician is kidnapped.
Series 3 / Episode 22
Don and his team of FBI agents investigate a possible terrorist attack on Los Angeles after they learn that a deadly substance may be contaminating the city's water supply.
Series 1 / Episode 6
While investigating a deadly freight train accident, Don and Charlie discover a shocking culprit who is on a mission to diminish public confidence in the railroad System.
Series 3 / Episode 23
Don and the FBI find themselves with double the work when they are on the hunt for two groups of robbers, one of which has stolen $50 million that was meant for a relief effort in Zambia.
Series 1 / Episode 7
After two teens are found murdered, the investigation leads Don and his team to uncover a dangerous counterfeit money ring.
Series 3 / Episode 24
Don and Charlie find themselves in a standoff with a bomber who claims to have a list containing the names of spies and double agents. A secret is revealed that will shake up the FBI team forever.
Series 1 / Episode 8
When new information on an old case comes to light, Don thinks he may have sent the wrong person to jail.
Series 1 / Episode 9
Don and his team must stop a sniper who goes on a killing spree in Los Angeles.
Series 1 / Episode 10
A dedicated FBI agent and his younger brother, a brilliant mathematician, take on criminal cases from very distinctive perspectives. One deals in hard facts and evidence and the other, in a world of mathematical probability and equations.
Series 1 / Episode 11
A dedicated FBI agent and his younger brother, a brilliant mathematician, take on criminal cases from very distinctive perspectives. One deals in hard facts and evidence and the other, in a world of mathematical probability and equations.
Series 1 / Episode 12
A dedicated FBI agent and his younger brother, a brilliant mathematician, take on criminal cases from very distinctive perspectives. One deals in hard facts and evidence and the other, in a world of mathematical probability and equations.
Series 1 / Episode 13
A dedicated FBI agent and his younger brother, a brilliant mathematician, take on criminal cases from very distinctive perspectives. One deals in hard facts and evidence and the other, in a world of mathematical probability and equations.
Series 2 / Episode 1
Don and Charlie investigate the murder of a judge's wife who was shot in her garage. It's unclear whether she was the intended target or her husband, who was hearing a death penalty case involving a gang leader.
Series 2 / Episode 2
Charlie assists the FBI after a woman is shot by a security guard when attempting to rob a jewellery store in Beverly Hills.
Series 2 / Episode 3
The FBI becomes involved with an investigation into the stalking of a popular singer. Charlie soon determines she could be getting harassed by more than one person.
Series 2 / Episode 4
Don and Megan are called to the murder scene of a powerful CFO who was soon to testify against her fellow executives. As there could be many disgruntled ex-employees, Don asks Charlie to narrow the list.
Series 2 / Episode 5
Don uncovers a secret code that begins the hunt for a skilled and trained assassin. The FBI must ultimately save the life of a Colombian exile living in Los Angeles.
Series 4 / Episode 1
Agent Colby Granger lands in prison after the discovery that he was a mole within the FBI, but he escapes, and it's up to Don and his team to track him down and uncover the truth.
Series 2 / Episode 6
Don and his team are assigned the mission to locate and catch the person responsible for releasing potentially lethal gas in the city's subway system.
Series 2 / Episode 7
When a father is killed in a home invasion, Don and his team investigate the connection between the murder and a number of robberies in the upscale community.
Series 2 / Episode 8
Megan feels responsible for an agent's death following an explosion at a meth house the FBI had targeted for a bust. When the kingpin eludes capture, it's discovered he may also be involved in child pornography.
Series 2 / Episode 9
After four people nearly die from poisoning, Don learns someone has been tampering with non-prescription drugs. Don is led to believe the person may be a former employee of the drug's manufacturer.
Series 2 / Episode 10
When a researcher who specialises in Native American antiquities is killed at the museum she works at, the FBI is called in because the museum is on federal land.
Series 4 / Episode 2
A series of secrets and blackmail involving a young, up and coming actor are exposed when Don and his team investigate the murder of a young woman in his Hollywood Hills mansion.
Series 2 / Episode 11
Don and his team must find the serial arsonist responsible for an innocent man's death.
Series 2 / Episode 12
When a fellow FBI agent working undercover is killed in a gang retaliation, Don and his team must investigate.
Series 2 / Episode 13
The murder of a young student at a card club leads the FBI to uncover a deadly card counting scheme.
Series 2 / Episode 14
The agents must stop an organ trafficking ring when they discover a young immigrant girl died while selling one of her kidneys.
Series 2 / Episode 15
A Cal Sci science student becomes the suspect when an expensive piece of equipment is stolen from the school's DNA lab.
Series 4 / Episode 3
A typical morning at a coffee shop turns into a nightmare when a car collides into it, leaving one person dead and many injured. But what appears to be a car's accidental loss of control is soon exposed to be more.
Series 2 / Episode 16
An anti-war bombing which kills an innocent man becomes personal when the investigation reveals surprising information about Don and Charlie's father's past.
Series 2 / Episode 17
When a psychic leads authorities to a deadly crime scene, Charlie sets out to prove it is just a fluke.
Series 2 / Episode 18
The FBI investigates the murder of a female Iraqi activist which happened on U.S. soil.
Series 2 / Episode 19
Don and his team investigate a school shooting only to be surprised by one of the suspects.
Series 2 / Episode 20
Don takes a deeper look at his life after he investigates the circumstances surrounding an ex-girlfriend's death.
Series 4 / Episode 4
After recognising numerological patterns in the Bible verses that the killer leaves behind, Don and his team are able to track the killer's movements but are one step behind when a twist brings the chase to an end.
Series 2 / Episode 21
When an assailant storms the FBI office with a gun, Charlie gets caught in the crossfire between the suspect and the FBI agents.
Series 2 / Episode 22
Don and his family are in danger when they become the targets of the suspects Don and the team are investigating.
Series 2 / Episode 23
Don enlists Charlie's help when the bodies of five young Asian girls found washed up are suspected of being infected with the Avian influenza virus.
Series 2 / Episode 24
Don and his team must stop a suspected serial killer who drugs and kills young women.