The team investigates multiple murders tied to a construction company that creates an experimental chemical that strengthens sea walls evidence from Hannah's previous mission in Oman is used against her.
Pride and the team reunite with conspiracy journalist Oliver Crane after the source for his latest story is murdered Hannah's former partner, Liam Somers, surprises her and shares a shocking revelation about an old case.
NCIS investigates the disappearance of a Navy entomologist after a deadly shooting at a research lab the team finds that a rare and deadly virus was stolen.
While under cover, Gregorio joins a social club for military wives after one of the members is contacted by an ex-boyfriend who is on the FBI's most wanted list.
When mummified remains are found at Halloween attractions, Brennan and Booth realize that they must find the killer by Halloween or there will be another death.
When the founder of an organic supermarket chain is found dead, Brennan and Booth suspect foul play by a rival farmer the two agents visit a new psychiatrist, who warns that the FBI may separate them.
The team investigates a footless corpse that was found in the woods Brennan and Booth's questioning leads to several suspects, including the victim's wife Angela agrees to undergo hypnosis to remember her former husband's name.
Brennan and Booth investigate when a soccer mom is blown up in her minivan the investigation uncovers that the woman was a member of the National Liberation Army.
A skull smashes the windshield of a car driven by a group of teenagers on the freeway a trail of suspects leads Brennan and Booth to a strange cannibalistic society Cam suggests that Angela hire a private investigator to find her ex-husband.
Brennan and Booth investigate a small skeleton assumed to be that of a 10-year-old girl Brennan's father (Ryan O'Neal) reappears in her life to deliver information from her past.
Potentially radioactive remains emit a green glow at the crime scene.
The Bancroft family calls on Brennan and Booth to investigate the stabbing death of Terence Bancroft Agent Sullivan invites Brennan to his basketball game.
After Booth's gun is taken away because he maliciously shot a clown ornament on an ice-cream truck, Brennan must go to Florida alone to investigate the death of a college student whose body is found inside an alligator.
Mac and Jack attempt to rescue a billionaire's son after he is kidnapped by a former Navy SEAL.
As Mac and the team investigate the suspicious death of Dawn's CIA supervisor, the evidence leads to a dirty CIA agent and a massive counterfeiting ring.
Mac and the team reunite with the Coltons, a family of bounty hunters, as they all search for a thief of classified intelligence.
Mac, Jack and Riley set out to find a mobster-turned-informant after he's kidnapped and taken to Chernobyl by an international crime boss Bozer struggles to keep a secret from Matty.
The team members pose as honeymoon couples at a resort in an attempt to befriend the son of a Serbian war criminal Bozer wonders if Matty knows about his relationship with Leanna Jack recruits Elwood to help him break into Matty's home.
When the BAU heads to Salt Lake City to look into a triple homicide, their investigation may lead to a fugitive.
The BAU tracks a conflicted killer in Virginia who feels remorseful after committing crimes Rossi receives a visitor.