Dark Door, The

'''Wilhelm, Kate. The Dark Door.''' New York: St. Martin's, 1988.

Mainstream thriller, mostly, except that the mysterious force causing death and destruction turns out to be a malfunctioning robotic space probe sent by aliens "to search out sentient life in the cosmos, but [now] perversly bent on destroying it." Rev. Adrian de Witt, SF&FBR Annual 1989: 446-48, source for this entry, and quote.