AceShowbiz -

Castle and Beckett have been very helpful for each other, but they are getting more attached in the upcoming season 5. The first promo for the next chapter of "Castle" has made its way out online, hinting that the romance between the novelist and the detective will be a major part in the storyline. "They've finally crossed the line... Now things will really get arresting," so a narrator says in the video, which does not include new footage.

Meanwhile, a glimpse at the new season was recently obtained in a form of set photos. One of the pictures shows Stana Katic (Beckett) filming a scene in her character's living room, while another shot sees her talking with Seamus Dever (Ryan) in what seems to be Castle's kitchen.

After taking their relationship to bed, Castle and Beckett will first decide whether or not to go public with their romance. "I think Captain Gates, who already hates Castle, I don't think he's going to want her to know and she's going to find a reason why that's no good," Nathan Fillion teased.

Meanwhile, Esposito will reconnect with one of the men from his Army unit, who is now working as a recruiter, since his partnership with Ryan is not going well.

The show will additionally solve the murder of Beckett's mother, but creator Andrew W. Marlowe has said "it leads to an explosive confrontation." Recent report revealed that two suspects in the case have important positions: one is a senator and the other is the vice president.

"Castle" season 5 will air every Monday at 10 P.M., but ABC has not announced its premiere date.