|Season 3, Episode 16|
|Air date||February 21, 2011|
|Written by||David Amann|
|Directed by||Rob Bowman|
Richard Castle and Kate Beckett investigate the murder of a New York taxi driver who was shot and stripped of his car parts. However, as they search for his killer, they are lead to a storage with trace amounts of nuclear substances and evidence that a bomb and terrorism is at play. Castle on the other hand sense that they have been set up and searches for the truth and ends up getting Beckett and himself caught in a very icy situation.
- Nathan Fillion as Richard Castle
- Stana Katic as Detective Kate Beckett
- Jon Huertas as Detective Javier Esposito
- Seamus Dever as Detective Kevin Ryan
- Tamala R. Jones as Dr. Lanie Parish
- Ruben Santiago-Hudson as Captain Roy Montgomery
- Molly C. Quinn as Alexis Castle
- Susan Sullivan as Martha Rodgers
- Adrian Pasdar as DHS Agent Mark Fallon
- Bahar Soomekh as Nazihah Alhabi
- Lochlyn Munro as Kevin McCann / Radford Hayes
- Alon Moni Aboutboul as Fariq Yusef
- Victor Webster as Josh Davidson
- Matt Bushell as Leeman Jones
- David Weidoff as Craig
- Piter Marek as Jamal Alhabi
- Billy Mayo as Senior Officer
- Hahn Cho as Hazmat Specialist
- Esposito: Everything points to him being popped for cash and car parts.
- Lanie: Not everything, baby.
- Beckett: Did you just call him baby?
- Lanie: Ooh. Did I?
- Castle: Dirty.
- Beckett (talk about her boyfriend Josh): It’s so funny, Castle, you know at first I loved that he was so busy. It’s just, um…just gave me an opportunity to keep one foot out the door, just in case.
- Castle: But with one foot out the door it’s hard to know where you stand.
- "Sympathique" - Pink Martini
- Castle and Beckett are supposedly exposed to high levels of cobalt-60 radiation from a "dirty bomb". Though none are known to have ever been constructed, a "typical" cobalt bomb is not radioactive until after it explodes (it is the explosion itself that turns harmless cobalt-59 into radioactive cobalt-60). This means that a real bomb would not have set off Beckett's radiation meter, and neither Castle nor Beckett would have been exposed to any radiation at all.
- Agent Fallon is played by actor Adrian Pasdur. In his role as Nathan Petrelli in Heroes, the first season story arc deals with Fallon saving New York City from an atomic detonation.
- Another major plot point is the use of racial profiling by Fallon, which leads the investigators down a time-wasting blind alley. Pasdur himself is of middle-eastern (Iranian) descent.
- Agent Fallon is from "homeland security". However, this is actually an umbrella term for many federal agencies, including the Secret Service, Border Patrol, TSA, FEMA and others. DHS has no "agents" of its own, and it's never made clear which agency Fallon works for. Unlike other federal agents seen on Castle, Fallon doesn't have any equipment or staff of his own; he entirely relies on the NYPD resources that he commandeers.
- Martha asks Castle whether he's ever heard of "The Serenity", a reference to Nathan Fillion's popular, albeit short lived, show with Joss Whedon, Firefly, where the Serenity was his character's spaceship.