2.02 – The Double Down

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When two separate murders are committed on the same night, Castle wagers Ryan and Esposito that he and Beckett will solve theirs first. The frenzied race to catch their respective killers and win the bet leads each investigative duo to a likely suspect, only to find that they both have airtight alibis. But bizarre twists in both cases force the two teams to work together to unravel the mind-bending mystery behind each murder.

2.13 – Sucker Punch

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While investigating the death of an Irish mobster, Beckett and Castle uncover a local turf war that may be connected to both a late-night infomercial guru and an international drug smuggling operation. But the case turns agonizingly personal when evidence emerges that the killer they’re chasing may have had a hand in Beckett’s mother’s murder.

2.20 – The Late Shaft

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When Castle appears on a late-night talk show to promote his book, Heat Wave, legendary host Bobby Mann (guest star Tom Bergeron) leans in during a commercial break and whispers, “They want me dead.” When Mann dies later that night, seemingly of natural causes, Castle has to convince Beckett that there was foul play. During the investigation, Castle is seduced by a Hollywood hottie (guest star Kelly Carlson), who was the other guest on Bobby Mann’s show the night he died.

2.04 – Fool Me Once

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When an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle’s delight at the case’s many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.

2.01 – Deep in Death

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Castle is wrestling with how to repair his relationship with Beckett, while struggling to finish his soon-to-be-published bestseller, Heat Wave. But circumstances force the pair back together to investigate the mysterious murder of a man found dead, tangled in the limbs of a tree.

2.16 – The Mistress Always Spanks Twice

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When a half-naked woman is found covered in caramel sauce and hanging by bondage cuffs in a public park, Castle and Beckett’s investigation takes them into New York’s underground world of sexual domination. Naturally the case serves as sexy fodder for their already charged relationship banter.

2.17 – Tick, Tick, Tick

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In the special two-part storyline, Dana Delany (“Desperate Housewives”) plays Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator who teams up with Castle & Beckett to hunt down a cunning and elusive serial killer. This will reunite her and Nathan Fillion, who played Dr. Adam Mayfair, the younger husband of Katherine Mayfair (Delany) on “Desperate Housewives.”

2.10 – One Man’s Treasure

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When a murdered man is found stuffed in the garbage chute of an apartment building and two women arrive to ID his body — one his wife and the other his fiance — Castle and Beckett have their hands full keeping the women from killing each other as they work to peel back the layers of the victim’s double life. Was it a jilted woman, corporate espionage, or a much darker secret that led to his demise?

2.11 – The Fifth Bullet

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When an art dealer is gunned down in his gallery, Castle & Beckett discover that a bullet is inexplicably missing from the crime scene. The mystery is deepened by an amnesiac who witnessed the crime but can’t remember what he saw or even who he is.

2.22 – Food to Die For

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A high profile chef is found frozen to death in the kitchen of a hot New York restaurant. Complications ensue when Castle and the restaurant owner, an old high school girlfriend of Beckett’s, share an attraction. Meanwhile, Beckett’s relationship with Det. Demming continues to grow.