Watch Castle Season 4 Episode 15 online via TV Fanatic with over 6 options to watch the Castle S4E15 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.

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Episode Details

Castle and Beckett are after a killer this week, which leads them to a major conspiracy. Jennifer Beals guest stars.

Rating: 4.7 / 5.0 (357 Votes)
Episode Number:

Castle Season 4 Episode 15 Quotes

Gives new meaning to the term overkill.


There, your better half.

Martha (as Castle's phone rings)