The Scrooge book is a sequel to the book a Christmas carol. 
Yes that is correct. I liked the back story of scrooge but The Christmas carol was a great story. 
It’s sort of based of a ghost story where the three ghost come to visit, past, present and future. 
Exactly, And they show him what he was acting like in each of those scenarios. 
Dickens actually wrote that story during a time when the British were re-evaluating past Christmas traditions. 
Oh wow, that must have inspired the story so much, especially the generation he was in, it was very different back in those days. 
He also actually went and visited a few school that only had street children to understand and be more sympathetic in his writing. 
Omg that must have been a great but also very sad situation to witness. No wonder his stories carry so much passion in them.
For real. He really digs down deep to fully understand the backgrounds and similarities with the characters he is creating to make them as real as possible. 
Visiting the street kids in the school must of really helped with when he wrote Oliver Twist also. And he absolutely puts his heart and soul in to all the books and the other things he has written.