SpendingherholidaysontheSwiss/Italianborder,Margareta(LinaRomay)meetscharmingSandraMauro(MonicaSwinn)andherhusband.Sheagreestostayintheirhousefortherestofhervacation,unawarethattheyaregoingtouseherforsmugglingdiamondsovertheborder.Theretheygetalittle'deeper'intoknowingeachother,butonenightsheawakenstostrangenoisesandfindsthecouplebrutallymurderedintheirlivingroom.Margareta,deeplytraumatizedandunabletospeak,istakentoDr.Antonio'sasylum.Antoniotrieshisverybesttogethertospeakandtorevealtheeventsofthedreadfulnight.Hisattemptsarenotunselfish,sinceeverymemberofthemedicalstaffhasalreadytriedtobethefirsttofindoutwherethemissingdiamondsarehidden.Onenightamysteriousblackrobbedpersonkillsoneofthenurses.Isthisjustarandomattackorhassomebodytriedtogetridofapossiblecompetitor.OnlyMargareta,whosawthekiller,isabletouncoverthemysteryccc