August Derleth’s “Posthumous Collaborations”After Lovecraft’s death, August Derleth based a number of stories on fragments written by Lovecraft and published these as “posthumous collaborations” between Lovecraft and Derleth. Since then, these stories have been marketed as being by “H.P. Lovecraft and August Derleth”, “H.P. Lovecraft with August Derleth”, or by H.P. Lovecraft alone. Some of the books that make this error include:The Lurker at the Threshold(Arkham House, 1945; Beagle/Ballantine Books, 1971; Carroll & Graf, 1988)The Survivor and Others(Arkham House, 1957; Ballantine, 1962)The Shuttered Room and Other Tales of Terror(Beagle/Ballantine Books, 1971)The Watchers Out of Time and Others(Arkham House, 1974)The Watchers Out of Time(Carroll & Graf, 1991; Del Rey, 2008)“The Ancestor”“The Dark Brotherhood”“The Fisherman of Falcon Point”“The Gable Window”“The Horror from the Middle Span”“Innsmouth Clay”“The Lamp of Alhazred”The Lurker at the Threshold“The Peabody Heritage”“The Shadow in the Attic”“The Shadow out of Space”“The Shuttered Room”“The Survivor”“The Watchers out of Time”“Wentworth’s Day”“Witches’ Hollow”Again, these works are entirely the work of August Derleth and cannot be considered among the works of H.P. Lovecraft.