Okay, so what the hell are they doing to Alexis?
This could have been a good storyline, if they had waited for like another season, but this is just ridiculous. She's 19, met this dumbass hippie on a vacation a month ago and now she's moving in with him? No, just no.
First of all, Pie is not likable AT ALL. He's just plain annoying. Had he been a likable character and have a good reason to go live on his girlfriend's father's couch for like a month, then I wouldn't have such a problem with it. Secondly, why not just put Alexis in a normal relationship with a NORMAL guy? Let it go for a while, let's say a season or so, and THEN make her move in with him. Castle would still be upset because he has the feeling he's losing his daughter, but at least he'd know she's with a decent guy, not with a clown like Pie.