"They didn't brief you?" said Dr. Kirby. "About a week ago, a London man named Simon Armistead was found dead in his home of an apparently self-inflicted shotgun wound to the head. Normally the police would handle this, but they found there were certain abnormalities about the corpse. You've seen the same sort of look on the locals here in Dunwich, so I take it you know what I mean. They called in UNIT, and Salem Shields and I conducted an autopsy. We confirmed that the manner of death was suicide caused by a shotgun wound, but what alarmed me were the abnormalities that had to be genetic. I decided to look into his family history to try to trace them back to their origins. His mother, Beth Armistead, was an historian who had died of breast cancer a few months back. His father, Miles Armistead, was still living in London. I interviewed him and collected some samples for analysis. He told me that Simon had taken a trip to Dunwich a couple of weeks after his mother's death, and he also remembered that Beth had gone there to do research on a book she was writing back in 1954, the year before Simon was born. He recalled that she seemed different after that, more aloof and sad, but she had never explained why to him, and she had never been the same after that. I convinced him to give me permission to exhume his late wife's body so I could run tests on her too.
"Neither Miles nor Beth had any trace of the anomalies I found in Simon, and that Beth did in fact die of cancer. However, I also found out that Miles could not have been Simon's biological father. I was able to tell that from blood types alone. Otherwise the testing would have taken weeks. I concluded that Simon was most likely conceived in Dunwich when Beth was there, so I headed to Dunwich to try to find out who his real father was...and I discovered the horrible truth."