Then, Mr. Flynn introduced Castle to his boss, LokSat, also known as…the dude who saved them earlier with a Korean barbecue taco truck. Of course, his biggest questions for Castle were who knew about his existence, and Castle was forced to tell him.

After LokSat left and Flynn returned, and just after he had given Castle a new IV of death serum, Ryan and Espo showed up, guns blazing. Meanwhile, Mason picked up Beckett and had every intention of killing her until Castle showed up and distracted Mason long enough for Kate to take him down.

They greeted all their friends and family members, hugged, and rejoiced that it was all over, before Castle and Beckett headed back to their apartment. Then, Caleb showed up. He wasn't dead! He shot Castle in the chest, then he and Beckett shot each other at the same time, then he went down, and she went down too. She and Castle looked like they were dying, hand in hand.