I just got done reading Roots of Evil by Sarah Rayne.

It was a very interesting story with a load of different sub plots which came together nicely toward the end. A wide array of characters and two couples emerge from it as well as a temporery delving into the mind of a psychopath murder.

I would suggest it to anybody of 16/17+ who doesn't mind reading through upsetting details. It goes back and forth from stories of WW2 and present day.