It was supposed to just be a normal basement - some storage boxes, dust, you know, the usual basement stuff. But when Milo is sent by his mother to fetch a sock from the basement of the historic home they've moved into, he finds a door in the back that he's never seen before. Turns out that the basement of his house is enormous. In fact, there is a whole world down there. As Milo travels ever deeper into the Basement World, he meets the many Things that live in the shadows and gloom . . . and he learns that to face his fears he must approach even the strangest creatures with kindnesss.