Winnie Zeng Shatters the Universe (Winnie Zeng #3)

In the third book of this epic fantasy series, kids from around the world are summoned to compete at the magical Shaman Youth Tournament! But with all the young shamans away, who will defend the human realm from evil spirits? 

If awards were given for multitasking, then Winnie Zeng would come in first place. Between juggling evil spirits and middle school--boy, does she have her hands full. Ordinarily, winter break would be her chance to catch up on anime, but this year marks the return of the Shaman Youth Tournament, where shamans around the world duel for the title of champion! To prepare, Winnie and her archnemesis, David, train for their toughest battles yet. But when some of their competitors start acting a little stranger--and a lot stronger--than normal, they realize they might be in over their heads.

Soon, it becomes clear that the spirit attacks in Winnie's hometown were only the beginning of something more sinister than any one shaman can tackle. Now, it's up to all shamans to take on this task and protect the human world. It just may be the last mission they ever receive. . . .