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First broadcast at 22:00 5 Nov 2013
When a woman is murdered, Castle and Beckett suspect that the notorious serial killer known as 3XK has returned to New York.
Castle and Beckett enter the world of struggling actors.
Two bodies rather than one are discovered in a coffin.
A young mathematician is killed with a 200-year-old bullet.
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Channel 5 Broadcasting Ltd. 2015