Travel writer Genie Clarke is finishing a project in her favorite European city—Rome but what began as a creative assignment turns deadly when she overhears a quartet of mafia operatives discussing a secret "Project." When they realize Genie’s heard them, she's attacked and left unconscious. Awakening in a hospital—alive but hunted—Genie finds the police unwilling to believe her. Only Detective Leo Angelini takes her seriously, uncovering ties between her assault, a murdered woman, and a ruthless criminal network.

With the threat escalating, Leo moves Genie into hiding, where she becomes both key witness and prime target. Cut off from safety and unsure whom to trust, Genie must outthink the conspirators determined to silence her.

From Rome's bright piazzas to its shadowed alleys, she faces a terrifying fight for survival-and an unexpected connection with the detective risking everything to protect her. She Knew Too Much is a lean, suspenseful psychological thriller about fear, courage, and the price of knowing too much.