Kate reaches the accident scene and looks at castle's burning car.. Then looks towards the ambulance parked there with back doors open and the doctors are just giving castle oxygen and other stuff.. They close the doors and ambulance leaves for the hospital.. Kate runs after the ambulance wearing her wedding dress and crying.. But she can't catch up with the ambulance.. So she asks police officer which hospital did they take him and is he alive.. she replies yes he is barely alive and tells her which hospital they took him too... so she drives fast to the hospital and at the same time over the phone calls espo n ryan explaining the scenario and tells them to come and check the crime scene while she checks up on castle at the hospital.

When she reaches that hospital, castle is not there.. He has been kidnapped and he is also injured.. It's Senator Bracken's people who did this.. Kate had put Bracken into jail but she forgot that he had a huge setup of mafia.. She didn't catch them all and since Senator is now in jail, there is a new leader running the shots.. This episode would be castle's recovery case in which they will be able to recover castle alive but they are not able to catch the complete mafia.. They end up killing the suspects who kidnapped castle while they are recovering castle.. So there are no more leads, Castle is recovered safely and they have a small discrete wedding ceremony at the end of this episode..