Dr. Elena Voss, a 30-year-old historian working in the Vatican Secret Archives, accidentally discovers a cipher manuscript that sends her hurtling through a temporal rift to 1943 Rome. There she encounters Captain Marco Ferretti of the Swiss Guard—guardian of a secret his family has protected for centuries. Together they must stop a spy network from weaponizing the rifts to rewrite history. From Nazi-occupied Rome to 1960s Jerusalem and back to a subtly altered present, Elena and Marco race against time itself—discovering that saving the world may cost them everything, including each other.