FBI Agent Charles Barker and his new partner Ellis Dove go undercover to infiltrate a weapons smuggling ring; an Internal Affairs team tries to enlist Dove's help in an investigation of his mentor.

Barker and Ellis are tasked with taking down a major drug ring run by a man named Jimmy Casserly; the partners have to break Casserly out of police custody in order to gather evidence in their case against him.

Barker and Ellis investigate a Romanian human trafficking gang led by the ruthless son of a diplomat.

An old friend gets Barker and Ellis in on a case involving millions of dollars and a deadly virus; a boy has been infected with a virus in order to blackmail his mother.

Barker and Ellis are assigned to keep a top nuclear physicist alive and get her to the Nuclear Regulatory Commission so she can testify; Rose stops by Ellis' apartment.

Barker and Ellis investigate an FBI agent who may have gone rogue; Ellis goes under cover at a security company to get close to the subject; Barker searches for the subject's former girlfriend.