Beth knows that Holmes survived and actually lived to a ripe old age, and further knows that his corpse is preserved in a glass-walled, honey-filled coffin in the basement of New Scotland Yard (this may be both a reference to the legend that Alexander the Great's body was preserved in honey, which does not rot, and also to the fact that, as stated in the original stories by Doyle, Holmes became a beekeeper once he retired).
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