Where the Monsters Are by Gerald Dean Rice

Gerald Parsons is on his way up. He’s a talented executive in line for a major promotion and married to a beautiful woman. But a chance encounter that may not be coincidence with a stranger who claims to know him begins to unravel his happy life. After a coworker is killed and another has his career sabotaged, the stranger shows up at his home, ready to party with his own special news, leaving Gerald to ponder if he is next.