Anastasia Romanov (1901-1918) was the youngest daughter of Tsar Nicholas II, the last Tsar of Russia. Her death was hotly debated for years, as she was believed to have survived her family’s execution.

Marguerite de la Rocque (c. 1542) was meant to disappear. That’s what her older relative, Sieur de Roberval, intended to happen when he marooned Marguerite on an uninhabited Canadian island. But against all odds, she survived instead.