Of any member of the Lovecraft Circle, Robert Bloch was arguably the most successful. As the author of Psycho and a couple of Star Trek (original series), just about anyone would have some vague knowledge of his work.
Bloch sold his first story (“The Secret in the Tomb”) in July 1934 right after graduating from high school to Weird Tales. He rapidly followed up with more having four stories in WT in 1935 and six in 1936. These early stories are all pastiche of H. P. Lovecraft. Bloch wrote the quintessential Lovecraft Lite. This was before August Derleth made the move to write in a pseudo-Lovecraftian style.
Some of these stories were collected in a Zebra paperback from 1981, Mysteries of the Worm. Lin Carter edited the book. In fact, this was supposed to be a start of a new series that was going to be like the Ballantine Adult Fantasy series but more pulp magazine in origin. For whatever reason, the series did not happen.
Here are the contents for Mysteries of the Worm:
Demon Dreaded Lore: Introduction by Lin Carter
The Secret in the Tomb Weird Tales, May 1935
The Suicide in the Study Weird Tales, June 1935
The Shambler from the Stars Weird Tales, September 1935
The Faceless God Weird Tales, May 1936
The Grinning Ghoul Weird Tales, June 1936
The Dark Demon Weird Tales, November 1936
The Mannikin Weird Tales, April 1937
The Secret of Sebek Weird Tales, November 1937
Fane of the Black Pharoah Weird Tales, December 1937
The Unspeakable Betrothal Avon Fantasy Reader #9, 1949
The Shadow from the Steeple Weird Tales, September 1950
Notebook Found in a Deserted House Weird Tales, May 1951
Terror in Cut-Throat Cove Fantastic, June 1958
There was an expanded edition from Chaosium in 1993 with new introductions to the stories by Robert M. Price. He also added the following stories for this edition:
The Brood of Bubastis Weird Tales, March 1937
The Creeper in the Crypt Weird Tales, July 1937
The Sorcerer’s Jewel Strange Stories, February 1939
There was a third edition from 2009 which added even more stories:
The Opener of the Way Weird Tales, October 1936
The Eyes of the Mummy Weird Tales, April 1938
Black Bargain Weird Tales, May 1942
Philtre Tip Rogue, March 1961
With the 3rd edition, you get all of Bloch’s Cthulhu Mythos fiction. Bloch wrote Mythos stories though 1937. He wrote five stories with Egyptian mythology from 1936-38. Some also have Mythos elements. Bloch added to the Mythos mainly by adding medieval sorcerer Ludvig Prinn and his blashphemous tome, De Vermis Mysteriis (Mysteries of the Worm).
Some of these stories, especially the earlier ones come off as slight. Bloch was working thoroughly in a pulp execution. You don’t have the info-dump of Lovecraft but you also don’t have the heaviness.
Bloch began to go in other directions in 1938. “Slave of the Flames” (Weird Tales, June 1938) pointed the direction he would take that would eventually lead to Norman Bates and Psycho. Bloch would experiment with some other story types. He wrote one sword and sorcery story and a few weirds with historical backgrounds including one pirate story.
Going through the stories in Mysteries of the Worm was interesting with the prose stylistic change in the last four stories of the original Zebra paperback. “Terror in Cut-Throat Cove” reminded me a lot of John D. MacDonald’s “Travis McGee” novels in style and setting.
It took me about 16 years to find the Zebra paperback. For whatever reason, not many copies were printed or there was poor distribution. You just don’t see it in used bookstores. I actually got the 2nd edition Chaosium trade paperback first before finding the Zebra paperback at Pulpcon in the late 1990s. Given the choice, get the 3rd edition Chaosium trade paperback because it has the most stories. Robert M. Price’s introductions are always entertaining also.
The 3rd edition is still available. If you have read Lovecraft and interested in reading more Cthulhu Mythos fiction, this is a good starting place.