Kate spends the night with new Miles, but their encounter is far more awkward than either expects. Later, Dan makes a disturbing discovery.

After finally visiting the fertility center, original Miles sneaks into the town hall as a bystander to witness the vote on the telecom contracts.

Now aware of her husband’s other self, an understandably upset Kate lays down a few rules. Meanwhile, new Miles gets some advice from his sister.

When both versions of Miles agree to divide and conquer their collective life, the original has a hard time sharing responsibilities.

Reinvigorated and loving life, new Miles takes charge at work while reconnecting with Kate. But when original Miles comes calling, things get messy.

Fearing his career and relationship are both going down the tubes, Miles heeds the advice of a newly successful co-worker and visits a mysterious spa.

When a lothario is killed, Castle and Beckett suspect that the victim’s mysterious double life holds the key to his murder. Their investigation leads to a shocking twist that threatens…