SomethingquiteunexpectedhappenswhenAnnieisforcedtospendthesummerwithheraging,warriorgrandmotherinthesleepyruraltownofSingingRocks,China.Itdoesn`ttakelongforAnnieandhercousinYongtofindoutthattheirgrandmotheristhekeeperofthreesecretandpowerfulmasksthatwillguidethemintheirquesttobethenextgenerationofwarriorstohelpsavetheworld.