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简介：14yearoldSvenisatechnicalgenius,whohasrebuiltanoldcaravanintoaradiocommunicationcenter.Viaradioheisincontactwithhisfather,whoworksatabigshipattheothersideoftheglobe.OnedaytheradiocommunicationissuddenlyinterruptedbysomethingwhichsoundslikeaLatinmass.InschoolSvenattendsalessonaboutradio-astronomy.Theteacherexplainsthatastronomerscanreceiveradiowavesthatarethousandyearsold.SvenunderstandsthattheLatinmassheheardwastransmittedtohimfromanotherage.Hegetscuriousandstartsmakingexperimentsbyconnectinghisradiokittobiggeraerials.WhenhesitsinthecaravantogetherwithhisfriendsBoandPetra,theynotonlyheartheLatinmassonhisradio,butthewholecaravanisturnedintoatime-machinethatbringsthemtotheMiddleAges.Theygetintroublewithsomewarriors,whocapturePetra,whileSvenandBoescapewiththehelpoftheirtime-machine...…