Librarian Gloria Mundy inadvertently becomes embroiled in a labyrinth of danger and intrigue after a chance encounter with a man named Tony, who begs her for help before mysteriously disappearing. Her seemingly mundane life takes a sharp turn as she discovers that Tony was carrying microfilm connected to an assassination plot targeting the Pope during his upcoming visit to San Francisco. Pursued by sinister henchmen, Gloria finds herself thrown into a world of espionage and suspense, navigating a series of life-threatening situations. Desperate to unravel the mystery and stay alive, she seeks assistance from the police, only to find their response dismissive because of her implausible-sounding story.

The situation escalates when she crosses paths with Tony Carlson, a handsome yet skeptical detective, who is initially doubtful but soon realizes the gravity of the threat surrounding Gloria. The tangled web deepens, and the two are drawn into a dangerous cat-and-mouse chase across San Francisco. Together, they must decode cryptic clues and connect baffling pieces while keeping one step ahead of the criminals who will stop at nothing to silence Gloria forever. Amidst the chaos, an unexpected camaraderie develops between Gloria and Tony, burgeoning into romantic tension as they work tirelessly to thwart the meticulously orchestrated plan threatening the Pontiff's life. Their fate remains uncertain as they grapple with foes and unveil startling secrets along their perilous journey.