It will be from Kate's POV. It starts in ep 09 in s 04 (Kill shot). Kate is still with Josh but they have lots of fights. And he maltreats her. He rapes her but she doesn't tell anyone. She loves Castle but Rick doesn't know it.
This story is the interesting story of Castle and Beckett. I'm combining regular the Castle story with a peculiar twist, I hope you enjoy.
EVEN THOUGH THE STORY IS COMPLETED I HUGHLY RECOMMEND READING IT ;)