In a world filled with unyielding commitment to the postal service, a relentless inspector is thrust into a heart-pounding investigation following the tragic murder of his fellow colleague. Determined to unearth the truth, he embarks on a dangerous journey, only to discover that the only person who can shed light on the heinous crime is a vulnerable nun. Little does he know, the killers have set their sights on eliminating this key witness, plunging him even deeper into a web of deceit and danger. As he races against time, he must navigate treacherous obstacles, unravel hidden secrets, and protect the nun at all costs, as the fate of justice hangs precariously in the balance.