Toward the end of the 19th century, lurid tales of killer plants began popping up everywhere. Terrible, tentacle-waving trees snatched and swallowed unwary travelers in far-off lands. Mad professors raised monstrous sundews and pitcher plants on raw steak until their ravenous creations turned and ate them too. The young Arthur Conan Doyle stuck closer to the science in a yarn featuring everyone’s favorite flesh-eater, the Venus flytrap.