The Fourth Scenario is a sci-fi novel available on Amazon.

Visitors from the planet Verdant came to Earth half a million years
ago and altered the DNA of the inhabitants to produce a species in
the aliens’ own likeness. Over the millennia, the Verdantians
continued to monitor progress of the human race on Earth but by the
middle of the twentieth century were alarmed that the inhabitants
showed no sign of ever managing to civilize themselves. Verdant
decides to make contact.
  The alien craft lands and two women alight from it. One of them,
Charlie Newton, is known to have been raised on Earth. The two
women’s message is that mankind is about to self-destruct.
  Charlie’s ex-fiancé, John Day, is told by President Bennett to get to
the bottom of the mystery. What’s behind this unbelievable
prophecy?  John rekindles a former relationship with secret service
agent, Deborah Ricci, while the President and his cabinet struggle to
determine the real reason for the sudden appearance of the extra-
terrestrials.