'Castle' Season 7, episode 20 spoilers will focus on the murder of a personal injury attorney. It will also put the spotlight on Rick and his still unexplained three-month long disappearance.

According to a report, episode 20 of "Castle" Season 7 titled 'Sleeper' will be revisiting Castle's disappearance mystery. Fans will finally get the chance to uncover the mystery surrounding the incident that Rick has no memory of. Perhaps, we could finally learn a thing or two about what happened to Rick that infamous day he disappeared. Did he act in the name of good, or was brainwashed to the point of something terrible?

If you can still recall, Rick Castle was a missing person for two months and when he returned he had no memory of that time, after he disappeared on his and Kate Beckett's wedding day. He had no clue about whether he himself decided to go away or someone abducted him. After the initial episodes, Castle's disappearance mystery took a back seat.

In recent interview with TV Line, Seamus Dever who plays Detective Ryan teased about fans should be expecting for the remaining episodes of Season 7.

"There is, of course, the one that everyone has been hanging on, waiting for, since the beginning of this season," Dever said when asked to drop some spoilers. "What happened to Castle? Where did he go for those three months?"

Dever also added that episode 20 will be revising the mystery substantially. There can be a feeling of "finality" but it will not completely close the door on the mystery that is related to the mythology revolving around Castle and Beckett.

In the preview video posted on YouTube, Castle is seen talking to someone "As the days go by, I don't wonder where I was or what I did."

Showrunner David Amann also spoiled some events that will conclude the current season.

"Obviously, the 150th episode is a milestone for the show but it also directly precedes the season finale," Amann revealed. "At this point, we intend Episode 22 to be a buoyant, classic episode of Castle, while [the finale] will focus on compelling, high-stakes story-telling surrounding Castle and Beckett mythology."

Meanwhile, ABC has yet to announce the 'Castle' Season 8 renewal or cancellation. Whether or not fans will see more of Rick and Beckett after they take the final bow for season 7 is still unknown.

Fans, what do you think happened to Rick during his months of disappearance? Let us know your thoughts below regarding 'Castle' Season 7, episode 20 spoilers.