• Will ‘Castle’ return for Season 9 after Season 8 finale?

Will ‘Castle’ return for Season 9 after Season 8 finale? (Photo : Facebook/ Castle/ABC)

"Castle" Season 8 finale (episode 22) is set to air on May 16, Monday. The episode titled "Crossfire" also happens to be the series finale that marks the end of the ABC's long-running police procedural starring Nathan Fillion (Richard Castle) and Stana Katic (Kate Beckett). Here are the detailed spoilers for the final chapter of the series. Read on to find out how it all ends for Rick and Kate. Fans can watch "Castle" series finale online via live stream. Scroll down for the link.

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[Spoiler alert! This article contains spoilers for "Castle" Season 8 episode 22 (finale) spoilers. Do not read further if you don't wish to know more about it.]

Fans must brace themselves as the show will finally address the LokSat conspiracy plot. "Castle" Season 8 episode 22 (finale) will see the conclusion to the storyline. At the same time, the series finale is expected to conclude the iconic couple Rick and Kate's love story.

ABC has released an official synopsis for "Castle" Season 8 episode 22 on its official website. According to the press release, Rick and Kate will finally take on LokSat in the finale.

The detective duo will discover an important lead that helps them move forward with their investigation. However, an unexpected event puts their lives in danger.

A promo video for "Castle" Season 8 gives a glimpse of the events of the finale. The trailer teases some action-packed sequences and as well as some warm moments between Rick and Kate. The teaser hints at a tragic ending and death of Kate.

"Kate Beckett will be dead by the end of the night and there is nothing you can do about it," Mr. Flynn threatens Rick in the promo video.

The trailer shows Alexis and Martha hugging Castle as the voice suggests that "Everything ends in tragedy, even an epic love story like yours."

Will Kate make the ultimate sacrifice for Rick? Will she die?

Another promo video shows Rick in the custody of Mr. Flynn. The mystery novelist has been kidnapped for an interrogation about LokSat case. Mr Flynn asks Rick to tell him all the names of the people who know about LokSat. As Rick refuses to betray the people, Mr. Flynn injects him with a chemical that will kill Rick in an hour. Scroll down to watch the promos.

While it remains uncertain which one of the two will die at the end of the season finale, rumours claim that Kate will make the ultimate sacrifice in an attempt to save her husband.

"Castle" Season 8 finale (episode 22) airs May 16 at 10:00 pm on ABC. Fans can watch "Crossfire" online via live stream on abc.go.com after the broadcast of the final episode. Stay tuned for more spoilers and updates.