The Lion in the Box by Marguerite diAngeli is probably my favorite Christmas story. I have fond memories of being tucked into bed and being read this book. The Lion in the Box is the true story of five children of a widowed mother who find themselves in procession of a large box Christmas Eve. The children are told that the box contains a lion and that they're not able to open the box until Christmas morning. Told through the eyes of a child, this story's simple message of love, sacrifice, innocence of children, and gratitude for blessings big and small stays reminds us what is important during the holiday season. It's out of print, but if you can get your hands on a copy, you won't be disappointed.