Cetus Insolitus is an anthology of twenty-six classic sea monster stories, from giant squid and invisible octopuses to sea serpents and strange deadly fish. The stories range from the humorous to the darkly apocalyptic. Well-known stories by authors like H. G. Wells and William Hope Hodgson are compiled with pieces that have rarely been seen since their first publication in the 1800s or early 1900s. The stories include The Tail of the Big Sea-Serpent, Jim Newman's Yarn: Or, A Sight of the Sea Serpent, A Real Sea-Serpent, A Matter of Fact, The Rival Beauties, The Sea Raiders, In the Abyss, The Last Stand of the Decapods, The Voyage of the "Mary Simpson", Out of the Deep, The Sea Serpent Syndicate, A Tropical Horror, From the Tideless Sea, The Terror of the Sea Caves, The Mystery of the Derelict, Winkler Ashore: The Sea-Serpent, Crew Saved by Sea Serpent, The Thing in the Weeds, The Finding of the Graiken, From the Darkness and the Depths, The Stone Ship, De Profundis, Demons of the Sea, The Habitants of Middle Islet, The Finless Death, and The Octopus Cycle.