Castle season 6 episode 18 is going to present a new case to our favorite crime-solving couple, and based on what we have known so far, Castle and Beckett will be the target of the murderer once they find out the killer's identity. The hit ABC show will feature an interesting storyline this week, and it has something to do with ninjas and ballerinas. Rick Castle obviously figures out everything before someone else does, but his theories might lead him and Beckett into a very deadly situation. Catch the brand new series tonight at 10/9c on ABC, or watch Castle season 6 episode 18 stream using the free online stream link below.

Note: The following paragraphs contain major spoilers on the upcoming episode. If you don't want to spoil the fun and excitement of the show, simply scroll down to the bottom and look for the free online stream link their to view the episode online.

The upcoming Castle season 6 episode 18 is going to present a new case to Castle and Beckett. A Japanese ballet dancer is mysteriously murdered, and all clues lead to the dancer's secret life which is quite dangerous. Castle then finds out that a ninja could be the mystery killer. But when the investigation becomes clear and solid evidence is established, somehow the Castle and Beckett's lives become threatened. Additionally, Arye Gross is now back as Perlmutter, so we're pretty sure that the episode is going to be very interesting. Catch the brand new episode tonight on ABC, or watch Castle season 6 episode 18 stream through the free online stream link found below.

A preview to the upcoming Castle season 6 episode 18 titled "The Way of the Ninja" teases Rick Castle finding the possible murder weapon used in killing the Japanese ballet dancer. The promo clip then shows a ninja quickly grabbing the weapon from Castle's hand. The ninja then disappears into thin air. The problem now is how Rick is going to convince Beckett and the investigation team that he is not making things up when he claims that a ninja is behind the murder case. Furthermore, the preview also hints that Ryan and Esposito will have to visit a geisha club in order for them to find more clues on the identity of the victim. Watch Castle season 6 episode 18 via online access using the free online stream link at the end of this post.

Meanwhile, show fans noticed that Beckett is not wearing her engagement ring quite often in the show. Actress Stana Katic recently spoke about the issue. "(Her engagement ring) is something that Beckett's very protective of, because she loves it," she said adding that Beckett simply wants to keep things "professional." Watch Castle season 6 episode 18 stream using the free online stream link available below.

The official synopsis for Castle season 6 episode 18 reads: "A Japanese ballet dancer is mysteriously murdered, Castle and Beckett's investigation into her secret life uncovers evidence that she was killed by a ninja, and now that ninja is coming after them."

"The Way of the Ninja" is set to air this Monday night at 10/9c on ABC. Watch Castle season 6 episode 18 stream using this free online stream link here.