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Joshi briskly tracks Lovecraft’s contributions to amateur press publications, his successes and failures with magazine editors, August Derleth’s machinations to publish the huge, posthumous 1939 collection “The Outsider and Others,” and the astonishing post-World War II flurry of paperback reissues, criticism and scholarly editions of his complete fiction, essays and correspondence.

These days, Wandrei himself is probably most often remembered as the co-founder, with August Derleth, of the most revered of the small presses specializing in weird tales, Arkham House.

Long ago, August Derleth compiled two anthologies devoted to “poems of fantasy and the macabre”: “Dark of the Moon” and the cozily titled “Fire and Sleet and Candlelight.”

As pantheons go, Lovecraft’s cosmogony is fairly imprecise, with much of it enfleshed by his immediate disciple, August Derleth, and other writers.

The flow of information over video calls on May 11, the day Ms. Derleth started her new job, was “like drinking from a fire hose, like any normal first day,” she said.