Castle posits time travel as a possible element in the murder of a mathematician shot by a 200-year-old bullet. A tricked-out DeLorean and a suspect in Victorian-era garb help support his theory, but a link to a secret society may explain everything.
Elizabeth sees a therapist to deal with her PTSD; at the same time, she prepares for the president of Iran to sign a nuclear treaty; and works to foil a secret plot to assassinate the Iranian leader on U.S. soil. Meanwhile, the Secretary of State's office (more…)
Beckett and Castle tackle an upscale matchmaker's murder case, and they have company: the actress (Laura Prepon) cast as Nikki Heat, who wants a deeper grasp of her character. Her copycat image soon becomes too much for Beckett, but Castle likes it.
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