J.R. Nutt

The charred remains of a young Jeffersonian intern, the daughter of a highly respected former Jeffersonian scientist, are found in the building's incinerator. With the case hitting so close to home, the team has no choice but to suspect their own colleagues and question everyone from the upper echelons of the Jeffersonian scientists to the victim's fellow interns. When they learn that the intern had been working on artifact authentication for the Widow's Son serial killer case. they begin to wonder if her involvement could have put her life in danger. But when they discover a romantic link between the intern and a Jeffersonian employee, the motives behind her murder become even more complicated. Meanwhile, Booth agrees to pose as Cam's boyfriend and accompanies her on a family get-together, eliciting more attention than he bargained for from Cam's sister.

Castle's plans with Beckett are disrupted when a dying man stumbles into his backyard and collapses in his pool.

On the third season finale, Frankie and Mike are surprised to receive an invitation to Mike's brother Rusty's fast approaching wedding. But their surprise turns to panic when they discover that he has listed the Heck house as the site of the ceremony…without asking them. Meanwhile, Axl and his friends decide to become their own bosses and set out to form their own company to garner summer jobs, and Brick is upset with Mike when he finally accepts an invitation to a fellow student's party but is not allowed to go because it falls on the same day as the wedding.

Timmy (Adhir Kalyan) begrudgingly helps Russell (David Spade) adjust to a new lifestyle once Russell’s mother cuts off his trust fund. Audrey (Megyn Price) visits Jeff (Patrick Warburton) at his office and is horrified when she finds an unflattering picture of her in the boss’ office, and attempts to steal the picture, but her plan backfires. Meanwhile, Adam (Oliver Hudson) and Jennifer (Bianca Kajlich) struggle with keeping the romance alive in their relationship. Written by: Becky Mann & Audra Sielaff Directed by: Ted Wass

The CSIs are called to three different crime scenes in one night that are seemingly unrelated, but each case's forensic evidence reveals a common link. (TV-14)