The God Gene — F. Paul Wilson

Rick Hayden and Laura Fanning of PANACEA return looking for the missing link.

Rick's brother, Keith, a prominent zoologist at NYU, liquidated his assets, purged his research, and vanished.

Except for his resemblance to a man involved in a homicide using a nerve agent.

The only clue is the mysterious death of an odd, blue-eyed primate Keith brought back from East Africa. They're search takes them to an uncharted island off the coast of Mozambique into the hands of unscrupulous game smugglers, and the edge of evolution.