Homer Eon Flint & Austin Hall 
The Blind Spot [EPUB ebook] 

What was ‘The Blind Spot?’ A room in San Francisco where strange things happened — or a doorway into another cosmos, a different world, or perhaps the key to the past or future? What would happen if two things occupied the same place at the same time — even such a small space as a single room in a modest house? And if those two things happened to be two worlds — this one and…another?