I’d like to make a contribution to your website (which I discovered recently and LOVE by the way). This book scared the hell out of me as a child. It was about a girl who was in charge of taking care of her baby sister and basically from what I remember, the baby is stolen by goblins. Way before LABYRINTH, and not as cute and fun like some of Sendak‘s other books, this traumatized me.
I had just had a little sister for the first time when I first read the book in the early ’80s, and I feared this was going to happen my sister while I was “in charge” of looking after her. The illustrations are creepy, and to me was just not a kid friendly book.