A rookie undercover FBI agent is teamed with a seasoned veteran to stop a terrorist arms deal, only to discover that his partner is the one being investigated by the Bureau.
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Barker and Ellis' investigation into a major drug deal uncovers a Chicago police lieutenant's deadly revenge scheme.
Barker and Ellis enlist a frightened prostitute in an undercover operation aimed at bringing down a sex slave ring run by the ruthless and well-connected son of a Romanian diplomat.
Ellis and Barker race against the clock in an effort to save an eight-year-old boy who's been infected with a mysterious virus in a scheme aimed at forcing his mother to steal millions of dollars worth of valuable jewels.
Ellis and Barker must protect a nuclear scientist who has been marked for death to keep her from testifying at a top-secret government hearing.
Ellis and Barker investigate a shady corporate security firm where an undercover FBI agent has disappeared after being sent to investigate a series of high-profile murders.
The brutal murder of a beat cop sends Ellis and Barker undercover to expose the connection between a ruthless gang and the Chicago Police Department.
The investigation into the murders of a pair of homeless Army veterans sends the agents to Chicago's skid row and forces Ellis to confront his own painful memories of the Iraq War.
A double agent's tip leads Barker and Ellis to suspect a brilliant mathematician of passing missile secrets to the Chinese.
When he and Ellis are sent to a high-stakes poker game to catch an infamous assassin, Barker is reminded of his unfortunate involvement in the assassination of an American ambassador and his daughter 15 years ago.
To avenge the murder of Conrad's former partner, Ellis and Barker exploit a rift between two brothers at the head of a notorious Chicago crime family.
When a sting operation goes sour and makes Barker the suspect in the murder of an alleged counterfeiter, he and Ellis set out to prove it was a setup.
Barker enlists his few friends inside the Bureau to help expose the rogue agents responsible for a series of crimes, including the murder of an American ambassador.