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Threechildrenforceaclassmatetoatestofcouragetogetintotheirgroup.Duringthetest,whichconsistsinfindingaskullinanabandonedchurch,thechildisswallowedbyachasmthatopensonthechurchfloor.Theotherkids,whohadstayedout,rushinthechurch,lookinthedeephole,calltheirfriend,butdon'treceiveanswers.Thelittlesisterofoneofthem,whofollowedthem,burstsintothechurchandletsherselfdownbyarope,butfallsintotheabyss,draggingtheotherkids.Allfivechildrenfindthemselvesintooldcavesinsearchofawayout,helpedbyGrotto,acreaturealikeastalagmite.