Inanewdepartureforfantasythatwillchallengetheheadaswellasthesenses,thebodyofamutilatedforeignstudentisdiscoveredinthestreetsofthecrumblingEuropeancityofBes?el.CaseslikethisarerunofthemillforInspectorTyadorBorlúoftheExtremeCrimeSquad-untilhisinvestigationsuncoverevidencethatthedeadgirlhadbeeninvolvedinthepoliticalturmoilbetweenBes?elandits'twincity'ofUlQoma,inauniverseofparallelworlds.ForBorlútosolvethecasehewillberequiredtogoonanodysseyofthemind,ajourneyacrossbordersthatmustbe'unseen',tothecitywhichisbothacomplementandrivaltohisown.