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Professor Paul McCracken's final message to parasitologist Dr. Sara Devlin is brutal, but clear: he'd rather die than let the alien parasite within him live. For Devlin, the shock of McCracken's suicide is quickly replaced by the horror it reveals—the existence of a microscopic extraterrestrial organism with the ability to infect and control its human hosts. McCracken wasn't the first person to be infected. There are others. Many others, extending back to the dawn of mankind.

At first, Devli...