While having fun on Christmas Eve, a valuable lesson is learned in the seventh book of the "Crystal City" series. Carmella and Sam, both ten years old, and Max who is eight years old, are best friends who just happen to be cousins. With the help of an unlikely friend who can fly, they visit different places to see how others celebrate Christmas. After that, they fly up above the clouds to a city made of crystals. This is the seventh adventure the children have had in Crystal City. On this visit, Carmella's little three-year old sister, Clara, and her second cousins, Mikey and Matt join them. At the Christmas building, the children are met by a beautiful lady who is very wise and appears to be surrounded by white light. She takes them to a room with a sparkling silver star on the door. The words "Spirit of Christmas" are beautifully inscribed under the star. Inside the room, the children see an entire town that is decorated for Christmas. When the children are ready to leave, the beautiful lady imparts a bit of wisdom to the children about the lesson they learned in the "Spirit of Christmas Room".