There is great activity in the Hollister household upon the arrival of Domingo, the donkey promised Sue in New Mexico. The excitement mounts higher with the discovery of a note attached to the donkey's halter signed Y.I.F. So begins one of the two mysteries that run through this book. In the midst of the approaching Christmas season, the Hollisters work out a plan to use Domingo in a special project to provide gifts for the poor children of the town. The project, centered around The Trading Post, Mr. Hollister's sport and toy store in Shoreham, involves putting a life-sized model of Santa, his sleigh and six reindeer on the roof of the store and then filling the sleigh with gifts contributed by the people of the community. What happens when this wonderful plan seems completely spoiled by the disappearance of the model? Could there be any connection between the notes signed Y.I.F. and the disappearance? The five children find themselves in the middle of one of their most baffling puzzles. Here is a Happy Hollister book with not one, but two exciting mysteries along with the fun and companionship that unite this lively family.