The attractive owner of a local candy store is sweet on Caroline, but she's too embarrassed to date him after she had a mishap in the store.

While investigating the remains of bodies that have been deemed unidentifiable, five “squinterns” uncover the identity of a man who died as a result of the 9/11 terrorist attacks, propelling the Jeffersonian team to determine if he was a perpetrator or a victim.

When the lead guitarist of a rock band is murdered, the documentary crew that were following the band turn their cameras on Castle, Beckett and the team as they try to solve the case. The result is a documentary style episode of "Castle," which offers us a unique glimpse at our characters as they navigate a world that goes far beyond the rock & roll stage.

From "Silver Linings Playbook," actor Bradley Cooper; comic Robert Klein; musical guests Soundgarden

Muscle Man starts to go bald.

CIA Director David Petraeus steps down after an affair, Karl Rove faces angry benefactors, Jon Stewart assists Colbert Super PAC, and Ken Burns shares "The Central Park Five".

A talk with and performance by actress Nikki Reed & Paul McDonald; comic Dave Attell; DJ Qualls drops by for the cold open.

The top 12 sing live in a bid to make it to the next round.