"Diamond Lens with Other Stories" by Fitz-James O'Brien showcases the remarkable talent of an underrated master of weird fiction, bridging the gap between Edgar Allan Poe and later luminaries of the genre. This collection features some of O'Brien's most celebrated tales, including "The Diamond Lens," which intertwines a séance and murder with a microscopic world, and "What Was It?", an early exploration of invisibility that predates H.G. Wells' famous work.