When two murders take place on the same night, Castle bets that he and Beckett can solve their case before Esposito and Ryan can solve the other one, but strange twists force the teams to work together.
Castle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.
The mysterious circumstances surrounding an Arctic explorer's death take Castle and Beckett to the halls of the CIA; Castle believes the killer may be fooling the investigators.
Castle's book agent (Debi Mazar) approaches him with a career-changing opportunity, but accepting it would mean the end of his relationship with Beckett; the corpse of an unidentified woman is in a manhole.
Castle and Beckett go to a graveyard after the body of a young man sporting vampire fangs is discovered with a wooden stake through his heart.
An apparently staged scene from her recent music video is the backdrop for the murdered corpse of a promising rock star.
While investigating the murder of a bike messenger, Castle and Beckett try to uncover the scandals and secrets of a prominent family.
Castle and Beckett invade the world of ex-cons and escorts while investigating an assistant district attorney's murder; Castle's daughter shares a secret with Beckett.
Castle and Beckett have their hands full when two women -- a man's wife and his fiancee -- arrive to identify his body, found stuffed in a garbage chute.
When an art dealer is shot in his gallery, Castle and Beckett figure out that a bullet is missing from the crime scene.
While investigating the death of a bridesmaid at a wedding, Castle runs into an old flame (Alyssa Milano).
While investigating an Irish mobster's death, Beckett and Castle uncover a local turf war that may be connected to an infomercial guru and an international drug-smuggling operation; evidence causes the case to become personal for Beckett.
A family discovers a dead man in the house; Castle becomes known as one of New York's most-eligible bachelors.