1926, London. My name is Sarah Grey. I knew of Harry Price before I became his trusted assistant. He was notorious - London's greatest ghost hunter. Working alongside Harry meant devoting myself to his work, leaving behind my past - and I trusted him. I knew of Borley Rectory, too, before I visited it with Harry - supposedly the most haunted house in England. I knew there was no such thing as phantoms; the many witnesses must be mad, or lying. I knew I could visit Borley Rectory without fear, return without harm. These are the things I thought I knew. I now understand the true meaning of terror.