At the Croatian border, Grace Whitmore spots something suspicious- a stranger slips past the guards, and the mystery begins. From ancient castles to quiet villages, Grace must follow subtle clues hidden in the environment and human behavior, using every skill to uncover secrets that could vanish in an instant. Suspenseful, clever, and full of unexpected twists, The Croatia Border Crossing Mystery launches the Grace Whitmore European adventure series, with dangers that only grow sharper as the journey moves toward her next challenge: Lake Como.