Contents are: Introduction; "Extrapolation," "The Wages of Synergy," "Make Room For Me," "The Heart," and "The Incubi of Parallel X." Strange people in the worlds of Theodore Sturgeon..The woman who kept mad, blind faith in the goodness of her lover--a man who was betraying the whole world to the forces of ultimate destruction. The biochemist who desperately tried to control the drug he had invented--a chemical that turned love into a killer disease that would ravage the planet. The creature from space that committed suicide out of affection for the human being whose mind he had invaded. And others, uniquely memorable, fascinatingly unexpected.