Credit: Karen Neal/ABC Television Group © 2011 Disney Photo: Kate Beckett in Castle Season 4, Episode 17: "Once Upon a Crime"

Alright, Castle fans, see if you can solve this one: The official title for Season 4, Episode 20 is "The Limey."

A quick Google search has helped us identify that "The Limey" was 1999 crime film by Steven Soderbergh about "an extremely volatile and dangerous Englishman [who] goes to Los Angeles to find the man he considers responsible for his daughter's death."

The word Limey, according our bible (MerriamWebster.com, naturally), is slang for a British sailor or more generally, an Englishman.

Any theories for what this episode might be about, detectives in training? Tell us in the comments below!

Source: SpoilerTV.com

Credit: YouTube Photo: Castle Promo for Season 4, Episode 16: ''Linchpin'' (VIDEO)

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