I am trying to remember a book. The story happens in a mountain, if I remember correctly it takes place in a mountain refuge when the main character investigates about the death of other people of the refuge, and at the end he remembers he is the killer, he killed them in a psychiatric crisis. Do...

I am searching for a book about tantric sex for couples written by an Australian couple. I read the book in northeast USA in english language around 2006. I think I bought it in a book store at the time, though it could have been new or used. But it didn't seem like a very old book. I believe...