Before seeing Mr. and Mrs. Pennyworth at the Lookingglass, I assumed that my tendency to mourn out-of-print books was unique. Take, for example, Sweet Pickles. This series of children’s books focused on a town populated by 26 animal characters—Angry Alligator, Bashful Bear, Creative Camel, and so on—each with his/her own book. My father ordered these books through a subscription, and we received one in the mail every two months. I learned to read with Sweet Pickles. I attribute my love of maps to the hours I spent studying the town map attached to the back endpaper of each book.* What has happened to Doubtful Dog, Enormous Elephant, and Fearless Fish? They live on in my memory, but they become a little more translucent each time one of their few-remaining books is discarded. Someday, I realize, they will simply disappear.