Father of Lies

Father of Lies: A Darkly Disturbing Occult Horror Trilogy
In hopes to get my best friend to read more I let him pick a read for us to read. I finished it and my thoughts are below. He however has about three chapters left. Such a shame he has been so busy this is a great disturbing read.
A tale of madness and horror combined with social problems such as drug abuse, homelessness, poverty and minorities (travelers), as well as crimes such as child abuse, pedophilia and satanic rituals. It's disturbing because the spine-chilling events are believable and horrific.
Almost the whole team of doctors and staff looking after Ruby, an unidentified and complex patient, who seems to have a multiple personality disorder, suffer unexplained accidents, disappearances, death or mental breakdowns, in a rural English setting. In the lonely and atmospheric moors of northern England.
At first the explanation seems to lie in the field of medicine, but in the second half of the novel, especially the final third, the plot becomes more complex, with constant flashbacks, new characters and events which turn the story towards to a more Satanical and supernatural focus. Being a fan of Stephen King and loving a good creepy story this was right up my alley,
It is book one in a trilogy, so the end is not final. On the other hand, it is mostly satisfactory, but distressing due to the people involved in the crimes and their nature. There are however plenty of unanswered questions and threads to be continued in book two...
The action takes place in winter and the final scenes occur at Christmas time, so it's a chilling seasonal read, too.
The shocking crimes and rituals are not gorily or explicitly described, but they're still disquieting.
It is well written and I'm interested in reading the rest of the trilogy. I hope to have a friend to read them with if not I will continue alone.