What to read after Jackson Jones, Book 1?

When family reunion day arrives, Jackson, a lonely ten-and-a-half-year-old boy, is loathe to share his room with Great Aunt Harriet. She's a hundred and twelve years old, talks unintelligibly out of her toothless mouth, and has very, very, very big hair. But when he falls into her piles of hair during the night, Jackson encounters a world he'd never dreamed existed. In this magical fantasy complemented by zany illustrations, Jackson meets a host of extraordinary characters and finds that his life, far from being average and uneventful, is being written by the great Author, in whom all stories find their meaning.