The FBI's assistant director of national security, Linda Barnes, joins the BAU as they investigate a quadruple homicide of a group of roommates in St. Louis.
On December 10, 2011, 60-year-old social worker Francis "Maurice" Byrd is found dead in his home with multiple gunshot wounds. Security footage from a neighboring church reveals that prior to his body being discovered, Maurice had many visitors.
Esther throws a sober sleepover party to rekindle friendships she made at a bachelorette party, while Benji tries to move a childhood camp friend out of the friend zone.
As threats against her and Billy escalate, Joanna hopes that a neuropsychologist will prove that the girls were poisoned.
Gibbs and the team work to clear the name of retired Marine Sergeant John Ross when cyanide is found in one of the hundreds of care packages he sends to active-duty Marines.
A workplace compensation claim is not as straightforward as it first seems, and Frank is sceptical when a long-lost relative tracks him down.
Noel Fitzpatrick tries to save a tortoiseshell cat's leg by cutting out a tumour that has developed and replacing its knee with a unique bionic implant. Staffordshire bull terrier Rosie is admitted as an emergency after her back legs suddenly collapse in the park, and Noel performs essential spinal surgery to the diseased discs in Rosie's spine and advises a course of intense physiotherapy.
When a nuclear bomb detonates in downtown Central City, Barry, Jesse Quick and Jay Garrick slow down time by entering Flashtime. As everyone in the city is frozen, the three speedsters push themselves to the breaking point to save the city and everyone in it.
Deja's life with her mom, Shauna, and great grandmother Joyce unfolds from the very beginning. Randall and Beth welcome visitors to their home.
The devil is in the details when the artists must tattoo intricate Technicolor hot-air balloons. The battle is heating up for 100K and the title of Ink Master.
After a neighbor is stabbed, Dr. Choi enlists the help of April to figure out who is the real cause of the incident. Dr. Bekker and Dr. Rhodes expertise is put to the test when Noah misdiagnoses a patient. Dr. Charles is put in an uncomfortable position when Dr. Reese's estranged father comes to him as a patient without her knowledge. Meanwhile, Dr. Manning rushes to save a baby with whooping cough.
Callie speaks on a panel about Ximena’s struggle and realizes she may have a passion for something other than art. Meanwhile, Mariana is torn between two suitors.
Ryder and Marshall come to the aid of a pop star who has gotten stuck on a ledge.
Erika's Hollywood journey comes full circle; the women attend Camille's charity event, where Teddi's motives are brought into question; Dorit tries to repair her relationship with Lisa Vanderpump; Camille attempts to silence Dorit once and for all.
After Ben wets the bed at a sleepover with fellow classmates, Mickey, Alba and Jimmy go to extreme lengths in order to save his reputation. Meanwhile, when Sabrina loses her fake ID, Chip offers to help get her a replacement in exchange for a night out with her and her friends.
Mystery writer Agatha Christie vanishes, a man known as D.B. Cooper successfully hijacks a plane, and a series of anonymous letters haunts the town of Circleville, OH.
Chickaletta goes missing on Chicken Day! The PAW Patrol have to find her to save the festivities.
David and Moira hold a party for Patrick, but David worries about how his family would adversely affect Patrick. Alexis investigates with help a mysterious text from Ted.