Michaela Morgan 
The Thing in the Basement [PDF ebook] 

The Thing in the Basement is an atmospheric mystery story with a school setting. When the boy arrives at his new school everything is strange and different. The big, Victorian building has many storeys and a basement…As he passes the basement he notices a smell of heat and soot and burning. He looks down there and suddenly there”s bang and a flash, a roaring sound. He knows there”s something down there. Something nasty…something monstrous. And as the day goes on, all the evidence leads to suggest that the ”something” is a dragon…