Sorry, I realized this part of the story was missing.
5. Littlegrey was still amazed. In his world there were libraries in trees, but no trees in libraries !
What a wonderful place ! There were thousands of books, and books of all sizes and all kinds : about magic, plants, the best way of finding lost objects, the art of packing, of darning socks... Littlegrey, who was more eager for knowledge than for mice, was overwhelmed.
As for the little ghost, one thousand questions crowded his head. Who was this old tree ? How did it get there ? He looked so sad and tired...Could he speak ?
When he came to his senses, Littlegrey had already put his glasses on and was reading one of the biggest book of the library. Wait a minute ...Where did these glasses come from ? He had forgotten that Littlegrey was an apprentice wizard cat. The kitten knew no spell which would help them to find the good book, but these glasses were special : through them the little cat could read way faster.
While contemplating the fabulous powers of his new friend, the little ghost randomly took a little book of magic and sat next to Littlegrey.
There, in this peaceful and warm place, under the soft light of the lanterns, time flowed away.
The two friends were so comfortable among the old books that they did not see the dark plants which stood around them like poisonous snakes.