Inacalmandquietneighborhoodinthemountains,boysplayballinthestreet.Afterastrongandaimlesskick,theballisstuckinthebranchesofatreeinanextdoorland.Themoodisstressful:onceagainitendedupwherenoonewantstoget,theboysarescaredwiththosewholivethere,aladytheycall“badasscrone”,becausesheispracticallyahermitandneverreturnstheballs. The“badasscrone”isactuallycalledArlete,whoispreparingherselfforabigchallenge:receivingthethreegrandchildrenonherfarm,afteralongtimewithoutseeingthem.João,ElisandDavisuspectthattheirmother'sfightwithhergrandmothercausedthisdistance.Whenhergrandchildrencomes,Arletedoesnothavemuchintimacyanddoesn’tknowtodealwiththem.Childrenareundisciplinedandarenotveryhappytobethere.Asthegrandmotheriscompletelyaversetotechnologyandcommunication,thereisnointernet,nocellphonesignal.Besidesthat,sheisfullofrulesandrestrictionsandtheyhavehouseworktasks. Onthefirstnightoflivingtogether,thegrandchildrenstarttosuspectthatArletehidesabigsecret,whentheywatchherabilitytochaseinvadersawayfromthefarm.ThechildrenstillmeetToninho,agreatoldfriendoftheirgrandmotherwhoalsolivesontheland.Investigatinggrandmother’slifetakethemtothebigdiscovery:Arleteisaninjaartspecialist.Thisrevelationmakesthemclosertoeachother,astheirgrandmotherteachesninjaphilosophyandskillstothem.ThestrangenessandinitialresistanceofJoão,ElisandDaviisreplacedbyfascinationandadmiration.Whenthechildrendiscoverthatthereisatreasureburiedinthefarm,andtheysuspectthatthebanditswillreturntotakeit,theyneedtoputintopracticethetrainingandtheteachingstheyreceivedfromArlete.Grandmaandgrandchildrenwillhavetojoinforcestoprotectthefarm,thefamily,andfindthistreasurethatcanbringgenerationstogether.