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Rok 1191, Ziemia Święta, czasy trzeciej krucjaty. Na redzie Akki tonie galera krzyżowców z tajemniczym ładunkiem na pokładzie. Rok 1942. W pobliżu tego samego miejsca okręt podwodny torpeduje niemiecki frachtowiec, wiozący broń masowej zagłady dla Afrika Korps. Czasy współczesne. Czwórka polskich studentów archeologii odkrywa w kościele joannitów ślady tajemnicy sprzed ośmiuset lat. Razem ze swoim profesorem organizują wyprawę na Morze Śródziemne. Ładunek zatopionego frachtowca staje się celem arabskich terrorystów. Tajna broń Hitlera ma posłużyć do ataku na Stany Zjednoczone. Co łączy szczątki średniowiecznej galery i wrak statku z okresu drugiej wojny światowej? Jakie sekrety skrywa archiwum watykańskie i kto jeszcze poszukuje zaginionej relikwii, która mogłaby zmienić losy Kościoła? Słoneczne krajobrazy Malty, sztolnie hitlerowskiego kompleksu „Riese” w Górach Sowich, podziemia Watykanu i morskie głębiny staną się tłem dla intryg, bezlitosnej walki o władzę, fanatyzmu religijnego, ale też namiętności i zdrady, które splotą się z przygodami Krzysztofa i Marty, głównych bohaterów powieści, zaś mroczne zagadki przeszłości odcisną swoje piętno na ich losach.