Knock, Knock Pair of Books Project Would you like to teach your child about humanizing homelessness? Check out these two wonderful children's books, Knock Knock Give a Sock and Knock Knock, Where's My Sock? written by Adina Lichtman, founder of Knock Knock Give a Sock.  These two books are part of the Pair of Books Project, which helps to "turn transactions into interactions." Knock Knock, Give a Sock is about a young girl named Crystal who moves into a shelter with her family. She loses a lucky sock during the move. Will she lose her luck without the sock? Throughout this book, the reader learns about Crystal and others who live in the shelter, such as her friend, Faith, whose apartment got destroyed by a fire. Knock Knock, Where My Sock? is about a young girl named Didi who meets her neighbor on the street and learns that he needs socks. How will Didi help her neighbor, Diego? To learn more about Adina and watch her pair of books project video, click here.