Exclusive Castle Sneak Peek: Who Witnessed Rick's Crash?

Where in the world is Castle? One thing's for sure: Beckett won't rest until she finds him.
In the exclusive sneak peek from Castle's season premiere below, Beckett (Stana Katic) meets up with Esposito (Jon Huertas) and Ryan (Seamus Dever) at the crash site to get the latest.

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"We figured the car that ran Castle into the ditch is the same car he's in now," Esposito says. "Kate, everything that can be done will be done.""Espo, don't tell me that. They took him. I need to do something," she snaps, before Espo gets a call about a witness.Who is it? Watch the clip to find out. Castle returns Monday at 10/9c on ABC.