While having fun, a valuable lesson is learned in the third book of the "Crystal City" series. Carmella and Sam, both six years old, and Max who is 4 years old, are best friends who just happen to be cousins. With the help of an unlikely friend who can fly, they go up above the clouds to a city made of crystals. Once there, they are met by a wise and beautiful lady who appears to be surrounded by white light. She takes them to a room with the number "1,000" painted on the door. The children are surprised at what happens to Carmella's stuffed animal dog when he goes inside the room. When they follow the dog, the same thing happens to them! The cousins have lots of fun playing together in this magical room. When the children are ready to leave, the beautiful lady gives them love and imparts a bit of wisdom about the lesson the children learned in the "1,000 Room".