Beckett and Castle investigated the murder of a priest in an abandoned building and tracked down the priest's good friend, a gangster who grew up together. They were attacked by a group of people when they went to witness. They evaded the pursuit of witnesses and tried to contact the police. But is the witness really just a simple witness? What is the relationship between the mob boss and the priest?

Episode 9

Christmas is coming, a family of three is playing in the snow, and suddenly a body of Santa Claus falls from the sky. Beckett and Castle discovered that Santa Claus turned out to be an investor with an annual salary of 500,000 pounds. Why give up the easy life and become Santa Claus? What's the secret behind it? What will happen on the first Christmas after Beckett and Castle are together?

Episode 10

A female lawyer in charge of divorce was found in her car, and Beckett and Castle found that it seemed to have something to do with the suspected wife murder of a star many years ago. Did a star kill his wife to hide it? There are other things going on. Besides, because Alexis was ill, Castle's ex-wife lived in Castle's house again, and she and Beckett had many rivals.

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At the publicity party of two singers, the female DJ who left mysteriously was found dead in her home the next day. Beckett and Castle found in their investigation that the DJ seems to be related to a gang that specializes in stealing at luxury parties. Did this gang kill her, or did it have other reasons? This episode will see what kind of youth esposito will devote to this episode.

Episode 12

The founder of "Crazy Female College Students" was strangled by bra at the party. Beckett and Castle conducted an investigation together and found that the female bodyguard of the founder turned out to be a commercial spy. Beckett found that the founder's ex-girlfriend and opponents were both suspected of murder, but the final result was that the murderer was someone else, and the deceased was not as slutty as he looked. In this episode, Alexis' video blog drives Castle crazy.

Episode 13

A female postdoctoral environmental engineer was found shot and burned. But Beckett's team found that the deceased was actually related to the senator who killed Beckett's mother. This made Beckett think that the senator could be brought to justice, but found that the senator was actually the target of the real murderer's assassination, and the female deceased was only an obstacle that the murderer thought. This made Beckett doubt whether to handle the case fairly. This episode focuses on whether Beckett will finally fairly protect the senator from assassination.

Episode 14

In this episode, the heroine of a reality show was stabbed to death. Beckett and Castle found that a husband, wife and producer who had an affair with the deceased in the play were all major suspects. However, in the end, just like the style of this play, the murderer turned out to be someone else. In this episode, Beckett and Castle will spend their first Valentine's Day together. It's funny that Castle made an own goal.

Episode 15

When Beckett and Castle were investigating a traffic accident, they found a large number of professional firearms and listening devices in the deceased's home. Further investigation revealed that the deceased was related to a kidnapping case. Most importantly, Alexis seems to have been kidnapped together, so Castle is as worried about Alexis' safety as any other father. In this episode, Castle's love for Alexis is in place.

Episode 16

This episode continues the story of the previous one. Alexis made a video call to Castle through the negligence of a kidnapper. Beckett and Castle traced the call by phone, only to find that it was from Paris, which made the incident more complicated. Castle came to Paris alone in fear and tried to find Alexis. Beckett found that Alexis was the real target of the kidnapping in the investigation of the kidnappers. Is there anything hidden in this kidnapping case? The most surprising thing about this episode is that Castle's father finally appeared, and there are many scenes. This incident is directly related to him.

Episode 17

A young woman died mysteriously at home, and the autopsy found nothing. Castle saw a box of DVDs that the deceased received during the investigation, and found that everyone who saw this DVD would die in three days, so Castle began to worry. In the course of in-depth investigation, the same death cases were found. These victims were all witnesses of a serial killer. Although the witness was dead, his body was found stolen. Is this an evil spirit killing or another murderer?

Episode 18

A cake shop owner was shot, and the evidence at the scene directly pointed to a gangster. Beckett and his party found out that the cake shop owner was an informant of the FBI in the gang. One of the waitresses Beckett investigated was also an informant. What is even more surprising is that this informant actually knows Ryan. It turned out that Ryan was an undercover who sneaked into this gang and had an affair with the waitress. In order to continue to investigate the gang, the FBI asked the waitress to continue to return to the gang to find evidence, but Ryan voluntarily returned to the gang as an undercover for his own safety and investigated the murderer.

Episode 19

Two building security guards witnessed the murder of an IRS investigator through surveillance cameras, but the murderer covered up the main evidence with infrared rays. Beckett investigated the murder case and found that all the suspects had clear alibis. Castle, on the other hand, was forced to rest at home because of a knee injury, but unexpectedly found a case in which a husband killed his wife with a telescope in a neighbor's house. The two cases alternated and finally ended perfectly. There is no doubt that this episode is a tribute to Hitchcock's Rear Window.

Episode 20

In this episode, a female college student is abandoned outside the emergency room. Although the doctor rescued her, the injured person died. So Beckett and Castle intervened in the investigation, but in the investigation, they found that the female college students had huge lacerations on their faces. The deceased was considered to be an expert on bigfoot before his death, so Castle thought it was an event related to bigfoot, or the murderer was bigfoot. After further investigation, Beckett found that it was related to another murder of a female college student. The victims of the two murders were actually roommates.

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A venture capitalist was poisoned while eating in a restaurant. However, Beckett and Castle found that the venture capitalist was not the target of the murderer's poisoning, but died because the waiter brought the wrong dish. The real goal is another inventor at the same table. Then Beckett was appointed as a bodyguard by the inventor, which made Castle quite nervous. The most suspected waiter in the investigation was also killed. In order to keep Beckett away from the inventor as soon as possible, Castle had to speed up the investigation.

Episode 22

Beckett and Castle fall into the trap of the suspect in the investigation of an explosion murder. The suspect triggered the bomb switch, and Beckett stood still on the bomb. Castle chatted with Beckett by the bomb in order to be with Beckett. Unfortunately, the arrested suspect took advantage of the lawyer's carelessness and committed suicide at the police station. The police found the bomb with 30 minutes left. Esperanza and Ryan must race against time to find clues to defuse the bomb, while Beckett and Castle are constantly recalling the time when they met and fell in love.

Episode 23

This episode begins with a car bombing, but when Beckett and Castle arrive at the scene to prepare for the investigation, they find that all the physical evidence has been taken away by the FBI, and there is also a person who calls himself the Security Bureau at the scene to stop Beckett and Castle from investigating. However, Beckett did not give up the investigation. After investigating the deceased, Beckett and Castle found that the deceased was mainly engaged in deciphering the illegal activities of the government and enterprises, so he has been under the supervision of the government. During the investigation, Beckett and Castle found that the explosion was actually caused by a bomb dropped by a drone, which seems to be related to the military. Finally, Beckett and Castle finally found the murderer behind the scenes through the clues on the drone. Besides, because of Beckett's outstanding performance in this case, the people in the Security Bureau want Beckett to enter their system.

Episode 24

At the beginning of this episode, Beckett decided to interview for a position in the Security Bureau and won the favor of relevant leaders. However, she is worried about how to deal with her future in the castle. At the same time, in a humble hotel, a prostitute was found killed and hid in a water tower on the roof. However, as the case progressed, Beckett and Castle found that the identity of the deceased was not what it seemed. During the investigation, they found that the deceased had an unusual connection with a former lawyer. However, when they found the lawyer, they found him hanged in his room. In the end, they found the real murderer by looking for this clue, which actually originated from a car accident a year ago. The highlight of this episode is how Beckett chooses between career and love; And how did Castle handle the relationship between the two?