Castle Photos from "Sleeper"

The mystery into Castle's disappearance is reopened.

Check out these photos from Castle Season 7 Episode 20, "Sleeper" which is scheduled to air Monday, April 20th on ABC.

1. Beckett At a Crime Scene - Castle Season 7 Episode 20

It looks as though Beckett's made it to the latest crime scene but we have just one question.

2. Who is Missing? - Castle Season 7 Episode 20

We see Esposito. We see Ryan. Beckett's arrived at the scene of the crime but the one person we don't see is Castle!

3. Another Disappearance - Castle Season 7 Episode 20

After Castle's two month disappearance last summer, we certainly hope he hasn't gone missing once again.

4. One Heck of a Safe - Castle Season 7 Episode 20

Whoa! We don't know who was murdered here but we do know that's one heck of a gun safe. The killer left behind the weapons and the piles of cash.

5. An Even Bigger Question - Castle Season 7 Episode 20

But we have an even bigger question and it has nothing to do with murder. If Castle and Beckett dive back in to his mysterious disappearance, will Esposito have Castle's back this time?

6. At Least Kate Has Lanie - Castle Season 7 Episode 20

At least Kate has Lanie there. Something tells us that Beckett might need her best gal pal to get through this.

7. Girl Talk - Castle

It's always good to see Kate and Lanie sharing some girl talk on Castle. We don't see it often enough. "Sleeper" is the 20th episode of the show's seventh season.