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A death row inmate is felled by an unknown disease and House decides to take on the case, over Cuddy and Foreman's objections. Meanwhile, he also copes with Stacy who is working closely with him, and Cameron has to cope with a dying patient.

Danny and Chin Ho team up with NCIS agents Callen and Hanna when a suspect threatens to unleash a deadly virus on the population.

The team heads to LA to work with another NCIS team on a murder investigation, which soon turns into something bigger. Meanwhile, Tony begins snooping into Ziva's private life.

In Los Angeles, Gibbs and McGee continue working with the NCIS division in order to track a terrorist cell. Agent Callen goes undercover, while a psychologist uncovers the truth about the relationship between Gibbs and Agent Macy. Meanwhile, Tony fears that Ziva may not be loyal to NCIS.

NCIS agents from Washington, D.C., Los Angeles and Hawaii, in D.C. to attend the retirement party of a beloved Federal Law Enforcement Training Center professor, find themselves investigating his shocking suicide.