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Thomas,thefatherof12-year-oldPaul,hasdisappearedwithoutatraceforayearnow.WhentheboyandhisbestfriendMaxspendthesummerholidaysontheSwabianAlb,thetwotrytoinvestigatethedisappearanceofPaul'sfather.Todothis,theywanttofindalegendarycavethatThomasstudied.Buthisnoteshavetobedecipheredfirst.Theyalsohavetodealwithwildan..aaa