Caroline’s father asks her to go on a talk show to defend him when a former employee threatens to defame him in a tell-all book.

A mysterious stranger causes problems for Norma; Bradley is not happy when rumors spread at school; Dylan and Remo go on a fateful road trip; Norman takes up a grisly hobby.

When Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands: who murdered the victim, a government whistleblower, and why are federal agents trying to take over the case? The plot thickens when they discover that the victim wasn't killed by a car bomb but by a missile from a military drone.

Riario engages the Pope and a mysterious prisoner in a discussion concerning the count's defeat, while Leonardo searches for a rational explanation when an outbreak of demonic possession occurs at a convent, and the blame is placed on the Medicis.

Kenya is kidnapped, while Rafe moves a step closer to learning the truth about his son's death.

From "The Office", actor John Krasinski; from "Scandal", actress Kerry Washington; musical guest James Blake.

The guys enter a donut contest in hopes of winning a cameo on their favorite cop show.

Stephen plugs cOlbert's Book Club, conspiracy theorists explain the government's ammo purchases, dogs ride the Mary Jane train, and Robert Caro scares Republicans.

From "The Great Gatsby", actress Isla Fisher; from "Community", actor Jim Rash.

The playoff round begins with the Top 8 vocalists from Team Adam and Team Usher performing.