The Hamelin Plague

It began with a few small items in the newspapers – dead dogs and cats, a mutilated child, a series of unexplained fires. Then suddenly it exploded into a full sized catastrophe.
Huge mutants – half rat, half man – began to take over the world, stealing children for slaves and destroying their populations.

Dr. Theodore Piper had been experimenting with a sonic death ray. Could he find a way to stop the spreading horror of invasion.