A murder investigation launches Castle into what seems to be an alternate universe where he's never met Kate Beckett. Castle has to convince Beckett, Esposito and Ryan -- now complete strangers -- to let him participate in their investigation so he can find his way back to his own world. This inspires Castle & Beckett to finally take a trip to the altar.
Quest roles:
Scott Paulin(Jim Beckett), Julian Scott Urena(Renzo Conrad), David Francis Harris(Mathias Gensler), Jeffrey Nordling(Marcus Lark), Daniella Alonso(María Sánchez), Jacqueline MacInnes Wood(Chelsea), Kendall Clement(Judge), Paul Darrigo(Attorney), Reena Dutt(Indian Woman), Kate Huffman(Barista), Scott Anthony Leet(Jack), Byron Marc Newsome(Perp), Michael Scovotti(Crimson Rhino)