Hahn, Mary Downing: - Mary Downing Hahn 's many acclaimed novels include such beloved ghost stories as Wait Till Helen Comes, Deep and Dark and Dangerous,and Took. A former librarian, she has received more than fifty child-voted state awards for her work. She lives in Columbia, Maryland, with a ca...

Hahn, Mary Downing: - Mary Downing Hahn 's many acclaimed novels include such beloved ghost stories as Wait Till Helen Comes, Deep and Dark and Dangerous,and Took. A former librarian, she has received more than fifty child-voted state awards for her work. She lives in Columbia, Maryland, with a cat named Nixi.