"Diamond Lens with Other Stories" by Fitz-James O'Brien showcases the author's remarkable talent in weird fiction, bridging the gap between Edgar Allan Poe and later masters of the genre. This collection features some of O'Brien's most celebrated tales, including "The Diamond Lens," which intertwines a séance, murder, and a microscopic world, and "What Was It?," introducing an invisible, murderous creature that predates similar works by H.G. Wells and Ambrose Bierce. With bizarre elements like killer puppets in "The Wondersmith" and the haunting mystery of "A Pot of Tulips," these stories resonate with timeless themes of scientific curiosity and the supernatural.