Well, I'm not sure exactly as there could be many different versions of such a story. But generally, it might involve some villain or group who wants to stop Christmas by kidnapping Santa Claus. Maybe they hold him in a secret place and then the story could be about how the elves or other Christmas characters try to rescue him so that he can deliver presents on Christmas Eve.
Most likely, Santa Claus is one of the main characters as he is the one being kidnapped. Also, the kidnapper would be a main character, whoever that might be. And the elves are probably main characters too since they would be the ones trying to rescue Santa.
It might involve evil elves or a grumpy goblin kidnapping Santa to stop Christmas. Maybe it's a ransom for all the toys or to cause chaos in the holiday season.
A story like this could be a mix of adventure and drama. There might be unexpected twists and turns as the search for the kidnapped boy unfolds, along with character growth and revelations.
One popular 'kidnapped' fiction book is 'Kidnapped' by Robert Louis Stevenson. It's a classic adventure story. Another could be 'Gone Girl' which involves a complex plot where a woman goes missing under mysterious circumstances that could be considered a form of 'kidnapping' in a sense. And 'The Girl on the Train' also has elements of a character being in a dangerous situation that resembles kidnapping.