Who plays Richard castle in the tv show castle?

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Richard Castle is played by Nathan Fillion.
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What are the names of the cast for the tv show castle?

Rick Castle~Nathan Fillion Kate Beckett~Stana Katic Alexis Castle~Molly Quinn Jaiver Esposito~Jon Huertas Kevin Ryan~Seamus Dever Laine Parish~Tamala Jones Martha Rodgers~Susa

The tv show Castle is based on what book?

No book. 3 books are based on Castle. Heat Wave, Naked Heat and Heat Rises. Frozen Heat is the next book in series (publish date - September 2012)