Beckett is on the hunt for the man who shot her which puts Castle in a precarious position. Soon everything will be out in the open and nothing will be the same for the 12th Precinct.
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The only witness to a murder victim with human bite marks on his body insists it was a Zombie attack. Castle, Beckett and the rest of team must delve into New York's Zombie subculture to find the killer.
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His relationship with Beckett strained, Castle teams up with Detective Ethan Slaughter from the city's gang unit. But Slaughter's kind of police work could put Castle in real danger.
A dead British model has Castle and Beckett working with D.I. Colin Hunt from Scotland Yard. While investigating, they become suspicious about the activities of the British Consulate's Deputy General. Lanie persuades Beckett that she needs to make a move on Castle, sooner rather than later.
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Castle and Beckett must reconstruct the 47 seconds prior to the time a bomb exploded at a protest rally in order to find who planted the bomb.