The Valley of Eyes Unseen

The Valley of Eyes Unseen, published in 1924 by Gilbert Collins, is a science fiction adventure novel that follows scholar-adventurer Ronald Mirlees and his companions as they embark on a perilous quest through China towards Tibet. The narrative unfolds through a manuscript that reveals a hidden valley inhabited by a mysterious 'ghost-faced' people and a river of diamonds. The story begins with Mirlees's intervention in a Shanghai opium den and leads to a dangerous pursuit by a secret society linked to a Tibetan monastery, ultimately exploring themes of lost civilizations and coded lore.