Thomas Jerome Newton is an alien who has come to Earth in search of water to save his home planet. Aided by lawyer Oliver Farnsworth, Thomas uses his knowledge of advanced technology to create profitable inventions. While developing a method to transport water, Thomas meets Mary-Lou, a quiet hotel clerk, and begins to fall in love with her. Just as he is ready to leave Earth, Thomas is intercepted by the U.S. government, and his entire plan is threatened.
FBI agent Joel Campbell, burnt-out and shell-shocked after years spent chasing serial killers, flees L.A. to begin a new life for himself in Chicago. But five months later, Joel's best laid plans are abruptly cut short when his new hometown becomes the setting for some particularly gruesome murders--murders that could only have been committed by one man: David Allen Griffin. One of Joel's most elusive and cunning nemeses, Griffin has followed his former pursuer to Chicago in order to play a sadistic game of cat and mouse. Taunting Joel with photographs of his intended victims and leaving his crime scenes meticulously free of clues in order to keep the police at bay, Griffin derives as much pleasure out of watching Joel react to every movement as watching his victims die. But when Griffin moves into Joel's inner circle, Joel must quickly find some way to stop him before someone close to him becomes the next one to die.
Under the pretense of having a picnic, a geologist takes his teenage daughter and 6-year-old son into the Australian outback and attempts to shoot them. When he fails, he turns the gun on himself, and the two city-bred children must contend with harsh wilderness alone. They are saved by a chance encounter with an Aboriginal boy who shows them how to survive, and in the process underscores the disharmony between nature and modern life.
