The Psychopath Plague - Steven Spruill

Forty-Nine days to Doomsday-

The computer projections left no room for doubt- in seven weeks, so many of Earth's people would have gone murderously mad that civilization would collapse beyond any possibility of recovery. There was no known cause for the outbreak of insanity, and only dilettante Elias Kane had as much as a hunch about its origin. With his giant alien servant Pendrake, Kane was prepared to risk his life to solve the riddle of the plague of psychosis- but first he had to evade the madness of the planet he hoped to save!

Corner of cover missing.