One of the most riveting detective stories of the last century supposedly ended when the Russian government declared that bones excavated from a Siberian mass grave belonged to the Romanovs, Russia's last royal family, who were executed by the Bolsheviks in 1918.

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One of the most riveting detective stories of the last century supposedly ended when the Russian government declared that bones excavated from a Siberian mass grave belonged to the Romanovs, Russia's last royal family, who were executed by the Bolsheviks in 1918. Alec Knight, a researcher in the Stanford (Calif.) University lab of anthropological sciences, however, argues that...