Brennan and the team attempt to absolve Booth and get him released from prison. The remains of a man who has been dead for over sixteen years prove to be significant.

When a 15-year-old Jane Doe is found on the streets, it is up to Brennan, Jeffersonian Intern Arastoo Vaziri and the entire Jeffersonian team to figure out her history and if she is responsible for a recent murder

The bodies of twin boys, kidnapped five years earlier, are discovered. The investigation lead Booth and Brennan to a notorious kidnapper known as the Grave Digger. During the investigation, Brennan and Hodgins become the Grave Digger's next victims.

The team dives back into investigating a serial killer from the past, attempting to find “The Puppeteer,” who lives with his victims’ bodies before disposing of them. Meanwhile, Brennan works through her guilt over her retirement last year, blaming herself for not stopping the serial killer earlier. However, little does she know she might be in some trouble of her own.

Brennan receives some bones to identify, but is stunned when she discovers that the remains are those of her mother who disappeared when she was 15 years old. The determined date of her mother's death leaves Bones confused and angry.

When Dr. Sweets' book gets published, both Booth and Brennan read it and tell him about the first time they met: 6 years ago. The episode will give a new perspective on Booth and Brennan's relationship, and will also give viewers the chance to see Zack Addy again, and Dr Saroyan as a New York Coroner.

Rogue sniper Jacob Broadsky returns once again, claiming another victim and making Booth determined to put him away once and for all.

Aubrey works alongside the team to investigate a government conspiracy. DNA found on a previous victim helps the team to narrow down the suspects.

Booth and the rest of the lab desperately search for Brennan who was kidnapped by her former assistant, Zack Addy. Brennan's rescue is, however, just the beginning of their problems.

The team’s latest case takes Brennan back to her alma mater, Burtonsville High School, where she and Booth investigate the discovery of an unidentified skull and upper torso. With Angela’s help, they identify the victim as one of Brennan’s classmates, and notice a possible connection to a second murder committed 15 years prior. Brennan and Booth go undercover as a married couple at her class reunion to interrogate a set of suspects, where even as an adult, Brennan is still predictably misunderstood and her only friend lies in a strangely dark and offbeat janitor. Meanwhile, Hodgins spills a lab secret

The trial of The Gravedigger hits close to home for members of the team, and everyone at the Jeffersonian must work overtime to uncover the forensic evidence to elicit a conviction.

Booth and Brennan are called to the scene where a man's body was found hung like a scarecrow, gutted, and burned on the roof of a building used by the FBI to hide witnesses.

The notorious serial killer, Howard Epps, sets his prison cell on fire as part of a daring prison escape. Brennan is his target and her entire team is placed in danger.

On Halloween, two mummified bodies are discovered and found to be people reported missing the past two Halloweens. When Booth and Bones learn about a missing girl, linked to the suspect of the previous murders, the race is on to save her life.

Booth and Brennan investigate a mall Santa named Kris Kringle who was found dead by two elves. A series of clues makes the murdered mall Santa seem like he's the real deal.

When a man dressed as Santa Claus blows himself up during a botched bank robbery, Brennan and Booth work to identify the bomber and determine his motives. Meanwhile, Brennan makes plans to spend Christmas in El Salvador, but her father convinces her to spend the holidays with him and Margaret Whitesell, a newly discovered distant relative.

Brennan gets a glimpse into her own life when the body of a brilliant and career-driven surgeon is found in a rough neighborhood with multiple fractures in her skull and no indication as to how or why she was there. While the team investigates the case objectively, Brennan struggles to separate her own life from the victim’s as she perceives many parallels between them the more she learns about the victim’s past. Meanwhile, evidence found at the crime scene brings the team closer to solving the case, but it’s Brennan’s unique perspective that propels her to retrace the final events of the victim’s life. With the reassurance of a new friend and Jeffersonian security guard, Micah Leggat, Brennan makes a discovery about herself and learns a lesson about taking chances.

Brennan's father Max Keenan is on trial for the alleged murder of FBI Deputy Director Kirby. Everyone on the team, except for Brennan, is called as a witness for the prosecution during the trial. Brennan on the other hand is the forensics advisor for the defense, and she must rely on both her dedication to her family and her skill as an anthropologist to help free her father.

The team is on the case when human remains are found inside a barrel of wine during a wine tasting. When the victim turns out to be a wine critic whose scathing reviews were capable of sending a vineyard to its ruin, everyone from the winery's owner to the victim's own wife becomes a suspect.

With Kovac still at large, the team searches for evidence to track him down. After Brennan experiences a setback, the rest of the team must figure out how to find Kovac without her, putting everything she has ever taught them to the test. When all signs point to Kovac having outside help, as well as a hideout, Booth and Brennan go searching for him.

Brennan and her team are brought in to identify the body of a man found in a fallout shelter. While cutting into the bones of the man, Zach accidentally releases a deadly fungus, causing the team to be quarantined over Christmas.

The team helps Deputy Director Sam Cullen's daughter, Amy, when she contracts a rare form of lung cancer after receiving a bone graft. Booth and Brennan learn she is not the only victim with this rare form of cancer.

After digging up the skeletal remains of a young girl, the investigation points to a convicted serial killer on death row. The team follows cryptic clues that lead to another body, an accomplice, and a victim who may still be alive.

A wannabe singer Tommy Sour was found on a grassy location. The investigation leads Brennan, Booth, and Cam to the Checker Box Restaurant where Tommy used to sing. There are several suspects who took part in the open mike contest there, with talent scouts in the audience. The group comes together with a startling revelation for Brennan.

The pieces of a dismembered body are found lying in a purple pool of water, except the head is missing. The team finds that the body belongs to Jared Addison, a science fiction writer who had several mental problems. With Sweets' help, several suspects are hunted down, however the team has trouble finding enough evidence with the victim's head still missing.