Jure Grando was a peasant who lived in the small village of Kringa, just outside of Tinjan, Croatia. He died in 1656, leaving behind a widow and a wake of terror that haunted Kringa for the next 16 years.
Every night for those 16 years, the good people of Kringa would hear knocks throughout the city in the middle of the night. The knocks were warnings, a promise that someone who lived in a house that had its door knocked had little time left on this world.