This anthology collects 23 classic short stories with cryptozoological themes: unknown species, relict creatures from the past, and strange creatures hidden in dark corners of the globe. Stories include The Jheen, In the Avu Observatory, pyornis Island, The Fiend of the Cooperage, The Brazilian Cat, The Killing of the Mammoth, The Spell of the Bird, A Relic of the Pliocene, The Monarch of St. Elias, The Great White Serpent of the Malorli, Alfred Jenkins and the Didi, The Gregosaur of Black Lake, The Death-Trap, Last of the Race, The Air Serpent, The Terror of Blue John Gap, The Horror of the Heights, The Humming Bats, The Devil's Fish, An Alaskan Monster, The Last Egg of the Great Auk, The Shame Of Gold, and An Undiscovered "Isle in the Far Sea".