The peacemakers

Puckett, the Hitler-like dictator of Rockland, had plans to conquer Sunland, the only other nation in the world. To stop the tyrant, scientists produced sympathone, a love-inducing drug, which they secretly administered to the populce. But the S-project failed. Puckett and his warmongers were unaffected by the drug. And only one young scientist could prevent Puckett from destroying the last survivord on earth.