'Castle' Episode 5.23 Photos: Castle is Jealous of a New Man in Beckett's Life

When Beckett is assigned to protect Erik Vaughn, a charming billionaire entrepreneur whose life is in danger, she's forced to reflect on her relationship with Castle which has begun to plateau. Meanwhile, consumed with jealousy, Castle goes to extraordinary lengths to solve the case and separate the two of them, on Castle," Monday, April 29 (10:01-11:00 p.m., ET), on ABC.



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