The stories, with their date of first publication, are:
"The House on Curwen Street"
"The Watcher from the Sky"
"The Gorge Beyond Salapunco"
"The Keeper of the Key"
"The Black Island"
"A Note on the Cthulhu Mythos"
Characters
Laban Shrewsbury
The main character of The Trail of Cthulhu who is introduced in "The House on Curwen Street", Laban Shrewsbury is an anthropologist and professor of philosophy at Miskatonic University. Although he was born in Wisconsin, Shrewsbury spent most of his life in Arkham, Massachusetts. After publishing his first book, the controversial Investigation into the Myth-Patterns of the Latter-Day Primitives with Especial Reference to the R'lyeh Text, in 1915, Shrewsbury mysteriously disappeared. Shortly thereafter, a posthumous collection of his writings, titled Cthulhu Among the Victorians, saw publication. Just as mysteriously, Shrewsbury reappeared 20 years later and immediately began work on his next book, Cthulhu in the Necronomicon. Before he could complete this work, however, his home in Arkham was destroyed by an inexplicable fire in 1938. Shrewsbury was presumed dead and his unfinished volume was published as a posthumous work. Shrewsbury had actually escaped to Celaeno, fleeing certain Mythos horrors. Shrewsbury's manuscript, the Celaeno Fragments, remains under lock and key at Miskatonic's library. Shrewsbury also appears in Phillip O. Marsh's 1994 novel The Worm Shall Ye Fight!. Asked if Shrewsbury was a model for his character Titus Crow, Mythos author Brian Lumley replied: "No, for I was never too keen on him. I like to see a man build as he goes....Shrewsbury seemed to come life-size right from square one."
[|Andrew Phelan]
A one-time assistant of Laban Shrewsbury, he first appears in "The House on Curwen Street" and is the main character of "The Watcher from The Sky". He also makes a reappearance in "The Black Island".
Abel Keane
An assistant of Laban Shrewsbury who first appears in "The Watcher from the Sky", and also appears in "The Black Island". He was a Boston divinity student from New Hampshire who mysteriously disappeared after becoming involved with Andrew Phelan, a former tenant of his residence. At the end of "The Black Island", the final story in the sequence, he is murdered by Deep Ones.
Clairborne Boyd
Appears in "The Gorge Beyond Salapunco”.
Nayland Colum
In “The Keeper of the Key”, Colum is a London writer who vanishes from a ship bringing him home from Arabia. His best-known work is the novelThe Watchers from the Other Side, to which he was planning a sequel at the time of his disappearance.
Japhet Smith
In “The Gorge Beyond Salapunco”, Smith is an agent of the Cthulhu cult who pursued Clairborne Boyd to Lima, Peru.