ION Mystery

A body is found covered in scratches, leading the BAU to believe that the person responsible has a chronic skin disorder.

A child reappears one year after he went missing -- but the team must work quickly when a trick-or-treater disappears under similar circumstances.

The team has a difficult time finding a common denominator among several male victims in Montana; J.J. struggles with feelings about her sister's death.

The team believes a suspect is taking on the persona of an Internet urban legend when people with substantial social media followings are found dead; Savannah and Morgan try to find time for each other.

As the team investigates the disappearance of a prominent Boston attorney, secrets of the man's past are revealed.

The BAU tracks a conflicted killer in Virginia who feels remorseful after committing crimes; Rossi receives a visitor.

When the BAU heads to Salt Lake City to look into a triple homicide, their investigation may lead to a fugitive.

The investigation into frozen bodies found floating in a body of water in Nevada leads the team to believe the victims were members of a cult; J.J. confronts her trauma over her abduction.

The team searches for a killer who calls the authorities before committing his crimes; as Rossi prepares for a visit with his daughter, he gets news about the death of an old friend.

When a young man accidentally shoots a cop in self-defense and goes on the run, the team members find themselves in a moral dilemma on the best way to carry out justice; Barnes and her wife struggle with their plans to have another child.

The team heads to New Orleans to track down a con artist posing as the wife of one of Jack's old CIA aliases; enemies of his old alias resurface looking for revenge.

One of Murdoc's assassins agrees to hand over Murdoc to MacGyver in exchange for $10 million; the team finds itself protecting Murdoc from a former mentor who wants him dead; Jack realizes he may still have feelings for Riley's mother.

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.

The team welcomes a new member as they begin their hunt for a repeat offender and the child he kidnapped after murdering the boy's single mother; Jess tries to move past the awkward exchange he had with Sarah during their last encounter.

The team chases a serial killer whose endgame takes a shocking turn; Hana returns from medical leave; Jess and Sarah's relationship continues to evolve.

After Crosby's old army buddy is attacked in an apparent drug deal gone wrong, the team's quest for answers uncovers a dangerous web of conspiracy; Jess questions his relationship with Sarah after an unexpected encounter.

After a double murder takes place in a small town, the team goes after the vigilante who relies on internet sleuths to exact revenge on suspects in the name of justice; Jess and Sarah's relationship continues to grow, but not everyone approves.

When a young man accidentally shoots a cop in self-defense and goes on the run, the team members find themselves in a moral dilemma on the best way to carry out justice; Barnes and her wife struggle with their plans to have another child.

Six months after starting a new life with her family, Brennan becomes interested in a case to which she has personal ties; an FBI investigation begins when Booth goes missing.

Booth's location and condition become more mysterious when it's discovered that FBI Agent Miller has been hiding vital information; Arastoo makes a significant decision.

When Brennan officially returns to work at the Jeffersonian and Booth resumes his position at the FBI, remains are found at a fish farm; Hodgins encourages Angela to exhibit her photography work; Cam faces a difficult decision.

Brennan enlists the help of a fellow forensic anthropologist; investigating the death of a real estate agent whose remains appear to have been destroyed by coyote-wolf hybrids.

While investigating a case involving a headless corpse, Brennan and Booth encounter Ichabod Crane and Abbie Mills searching for answers of their own; Brennan and Booth come up with Halloween pranks.

Two sanitation workers (Sal Vulcano and James Murray) find a U.S. senator's corpse in a street sweeper; Aubrey looks into Jessica's past.

An escape artist's corpse is found in the woods; Booth and Brennan try to decide if the tooth fairy should visit Christine; Angela works on her photography with Sebastian Kohl (Gil Darnell).

A political journalist is murdered after publishing an article regarding corruption in the NSA; Hodgins' paranoia increases as members of the team realize they are being monitored; Brennan plans a surprise for Booth; a Thanksgiving celebration.

Booth and Brennan go undercover at an Old West-style shooting competition; Angela and Hodgins talk about the future; Cam and Sebastian grow closer.

The team investigates a police officer's murder; the team decides what is important to their futures.

Hodgins navigates life in a wheelchair; when a public defender is murdered, several of her previous clients had motives to kill her.

The team investigates the death of a men's rights organization founder who may have been the victim of domestic abuse; Brennan loses her temper during an interrogation; Angela and the team struggle with Hodgins' bitterness.

The team hunts for a serial killer who appears to have sinister interactions with the victims' bodies before dumping them; Booth and Aubrey consult a behavioral analyst to help find clues to the killer's identity.

A suspect in the murder of a convicted felon who had been released to a halfway house has ties to Booth; Brennan testifies at an FBI hearing about her assault of an unarmed suspect from a previous case.

The team investigates the death of a private investigator found frozen after being dumped in the Potomac; Aubrey finds shocking information connected to his father's whereabouts.

Pride believes Baitfish has returned and has the NCIS team chase down leads in an attempt to locate him.

When a sailor is killed in a strip club, the murder weapon turns out to be linked to other unsolved cases; Brody receives a visit from her ex-fiance.

During the autopsy of a petty officer who seems to have died of natural causes, an armed man holds Wade, Sebastian and Danny hostage in the morgue.

When a Navy commander's car is stolen with his baby inside, the team must determine if it was a targeted abduction.

LaSalle's brother, Cade, needs the team's help when he becomes a murder suspect -- and cannot remember what happened; LaSalle is determined to prove Cade's innocence, despite the wealth of evidence against him.

Baitfish murders a person close to the team in order to send a message to Pride; a citywide hunt for the elusive criminal takes place.

Pride has suspicions about a mole; new intelligence comes to light that indicates a breach at the ports.

While Pride remains on probation after his rogue takedown of the corrupt Mayor Hamilton, his team is closely monitored by a strict supervisor; the team must secretly investigate after the FBI takes the lead on a case involving stolen nuclear waste.

On Halloween, the team tracks a serial killer inspired by an iconic character; a blood bank is raided by an armed gang.

McGarrett and Lynn's date on a deserted island turns deadly when a mob boss gets involved; a gambler abducts a high-school football star's father in hopes of forcing the athlete to throw a game.

A charming con man (Kristoffer Polaha) helps Five-0 look for the person who murdered his partner; a police inspector from San Francisco (Julie Benz) works with Chin on an investigation involving the murders of five arms dealers.

When a college professor is killed, Five-0 goes back to school with Danny, who is posing as the professor's replacement.

When a promising local boxer's brother is murdered, the prime suspect is an outspoken opponent -- the reigning champion.

Danny and McGarrett try to solve their partnership issues with a couples retreat in Maui; Kamekona's past comes back to haunt him.

A special personal mission sends McGarrett's Aunt Deb (Carol Burnett) to Oahu; unstable Japanese WWII bombs hidden on the island are stolen.

Grover goes to Chicago to get a confession from Clay Maxwell; Chin and Kono are held at gunpoint by people who don't know they are cops.

A double homicide occurs that involves infidelity; McGarrett and the team share disastrous Valentine's Day experiences.

Danny's mom is questioned by the FBI; McGarrett works with a young, autistic man who might be able to help solve a murder.