Simon and his mom don’t have much--the cardboard house they built for themselves, a tiny Christmas tree, and a picture of an angel from a calendar pinned to one wall. The angel’s name is December. Simon’s mom says she sings to them when they’re asleep. On Christmas Eve, Simon and his mom take in an old woman who needs a place to keep warm, and the next morning, Simon wakes early to find that the old woman has vanished. Instead, he sees December, their Christmas angel, with her wings fanned out over their cardboard house. Could she be real?