You need to get back to where you collected the Horcruxes. To do this, you have to go back into the train.

(The cloaks are there, they are just invisible.)

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Do you see anything in the train that could hold a flame?

Grab the sconces that would hold candles on both sides of the and work together to pull the train back to the main castle.

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If you can’t make the train move or if it is stuck, go back to the Hot Stone room and exit out the door, make a left and exit the gazebo. Go back to the main entrance of the house and put in your code.

Once you are in the house go put the book where it goes in the Horcrux area and stab through it a few times with the tooth.

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There is a button behind the book, where the hole of the book should be. Make sure you hit this with the dragon tooth.

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Here is the riddle you would have found:

You may know the secret to taming the Monster Book of Monsters. If you don’t, it has been said that the bedside reading of any puff that huffs has always been a valuable holder for secrets.