Brennan's former forensic anthropology professor -- and ex-lover -- Dr. Michael Stires, surprises her with a visit to her lab at the Jeffersonian while in town to interview for a job.

When a young woman is shot to death, Beckett and Castle learn the gun used was the one a serial killer stole from Detective Ryan.

An old rival of Neal's lays down a challenge: to see if either of them can create the impossible forgery – fabricating a unique bottle of wine owned by Ben Franklin. As the rival uses brutal and deadly tactics to achieve his ends, Neal quickly realizes that much more is at stake than bragging rights, and he and Peter must figure out how to take the rival down once and for all.

Keller wants to halt his transfer to a prison by offering information on a forger; when Peter investigates, he is kidnapped.

When Keller kidnaps Elizabeth, Peter and Neal must work together to meet his ransom demand: the U-Boat treasure. Neal is forced to come clean with Peter about the hidden cache, and Peter must put this betrayal aside in order to save Elizabeth.

In order to cement his trust with the Pink Panthers, Neal must align with a dangerous enemy from his past and obtain an extremely valuable artifact. Peter find it difficult to keep their secret from Neal and Mozzie.

When an art dealer's wife is taken hostage at gunpoint, Luther leads a tense investigation. The hostage takers want payment in diamonds so, stalling for time, Luther substitutes a bag of replacement diamonds from the Serious Crime Unit's evidence safe. Luther and DCI Reed are on hand to arrest the gang members picking up the gems, but when everything starts to unravel Luther begins to suspect that even Reed has double-crossed him.

Melinda's mysterious new neighbor is haunted by an old classmate's dead grandfather, who suspects Tom kidnapped and killed his granddaughter.

After a wealthy man is shot at close range in an elevator just outside of his penthouse apartment, Mac and Det. Flack realize that a companion may have witnessed the murder. Their investigation leads Danny and Lindsay into the world of underage high school girls who disguise their age and revel in the Manhattan social scene in order to meet wealthy men. (TV-14)

The Clark family find themselves in a dire predicament. They must work together to discover a path to safety.

When a woman is found dead on the Hollywood Walk of Fame – with her body twisted into the shape of a pentagram – the investigation leads Lucifer and Chloe into the world of Satanists, where they soon realize evil doesn't always live where it's expected to.