'Castle' Season 7 Episode 13 Spoilers: Rick's Simple P.I. Case Turns To Murder; Kate Comes To Husband's Rescue

"Castle" season 7, episode 13 spoilers show a simple case handled by Rick quickly downspiraling into a full-blown murder as Kate comes to her husband's rescue.

In the next episode titled "I, Witness," Rick Castle will take on a routine private investigation case but it will turn deadly when he witnesses a killing.

More "Castle" season 7, episode 13 spoilers can be gleaned with the spoilers, which reads: "Castle is hired to uncover if a client's husband is having an affair, but the case takes a shocking turn when Castle witnesses the client's murder - by her husband. But with no proof that the killing took place, Castle and Beckett must investigate to expose the truth."

According to Cartermatt, Rick Castle and Kate Beckett are working again on a case, but they are not exactly partners.

"Rick is still working as a private eye. What ends up bringing them together is that after being hired by a woman to investigate her husband (who she suspects of cheating), he then witnesses the husband seemingly murdering her. However, he needs some sort of additional evidence to go along with it, and that is where the NYPD comes into play," it said.

Cartermatt added that this particular episode will likely set the stage of what to expect for Rick's private eye business.

"After all, the one that follows this is seemingly the big one, which could feature the return of Annie Wersching and at least one other familiar face, as well," it added.

More "Castle" season 7, episode 13 spoilers reveal that the guest stars for this particular episode are Brianna Brown as Eva Whitfield, Ivan Sergei as Cole Whitfield, Gregory Zarian as Scott Galloway, Audrey Marie Anderson as Aubrey Haskins.

Terrence Paul Winter and Amanda Johns wrote "I, Witness" while Tom Wright directs.

Watch out for more "Castle" season 7, episode 13 spoilers ahead of the airing date on Feb. 2 at 10 p.m. on ABC Television Network.