But that's not all.
Castle will also learn that mothers really do know everything, and that he may need to have a chat with his daughter before she goes off to college. See what we mean here:
Elsewhere, Castle will answer Beckett's phone and go through her stuff. No, not that stuff. He's already seen that stuff, as he jokes about in the following sneak peek:
Speaking of stuff.... you won't believe how Rick gets on the good side of Captain Gates. Turns out, she's a collector. Of what? Find out now:
Does this gesture kick start a new, unexpected friendship? It sure seems that way based on the final clip from Monday's "Secret's Safe with Me."