Watch Castle Season 5 Episode 21 online via TV Fanatic with over 5 options to watch the Castle S5E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.

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Episode Details

Beckett is assigned to protect a billionaire on this episode of Castle, which prompts her to reflect on her relationship.

Rating: 4.1 / 5.0 (289 Votes)
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Castle Season 5 Episode 21 Quotes

The things you notice when you're paying attention.


Would you rather play with a kid in an imaginary world or me in a real world?