‘Castle’ Season 5 finale photos: Castle and Beckett face murder and their future in ‘Watershed’

Photos from the “Castle” Season 5 finale, “Watershed,” indicate that some very serious relationship discussions are coming before the show breaks for the summer. They even go back to the swing set!

What do Castle (Nathan Fillion) and Beckett (Stana Katic) decide? That’s the big mystery. It’s probably even a bigger mystery than the murder itself. Because of course “Castle” has to have one of those too.

Is there a reason why Beckett is late?

Whether her lateness is important or not, the murder is of a young woman who is found floating in a skid-row building’s water tank.

As the investigation moves forward, the team finds out that there are more strange things about this death than previously thought.

Is that why Castle would be talking to Esposito (Jon Huertas) without Beckett?

Or do these pictures show something a little more personal?

We will find out when the “Castle” Season finale airs on Monday, May 13 at 10pm on ABC.