Charlotte Jones is finally ready to begin her lessons with the Society of Time Travelers—until a sky-wide alert announces the Nicholas of Myra, better known as Santa Claus, has gone missing. Now, Charlotte and her mother must embark on a search for him that will take them well beyond the boundaries of regulated time travel and into the wilds of the past so far back that nobody can help them if they lose their way. There they discover the journey of what made the man in red the myth he is today, and not is all as it seems as certain time traveling factions begin to step out from the shadows and directly interfere with the Jones family history. It will take a Christmas miracle to get everyone home safe and sound for the holidays.
A delightful romp, best read with the prior books in mind - although not a requirement to be able to enjoy this self-contained plot (complete with some hints of coming themes for future books).