In the fourth season opener, Bonnie and Adam's relationship is tested when he moves in with her and Christy for a few weeks. Also, Christy learns the hard way that it may be a mistake to try and meet men with Jill.
Rosalee surprises Monroe with a getaway for his birthday and invites most of the gang to join them; Renard spends the weekend with Diana.
To stop the rise of Renard, Nick devises a plan that'll take him out of his element; Eve & Rosalee race against time to get the spell ready.
When the team treats a 6-year-old with multiple health issues, they must collaborate with her mother (Jessica Collins), who is also a doctor; Wilson and House go on vacation.
As Beckett and Castle investigate a murder at a sci-fi convention, they encounter avid fans in costume, egotistical celebrities and a lot of drama.