When Jeff Marle returns home to Pennsylvania for the first time in years, he visits his old friends the Quayles. But the respectable family isn't as he remembered them - he's shocked by the tattered state of both the house and the Quayles' nerves. Patriarch Judge Quayle is poisoned right in front of Jeff and nearly dies, and this near-tragedy is followed by another poisoning, and then a more brutal attack. Without the help of his friend Bencolin, will Jeff manage to find the…