After my previous post here, I found the following review on Goodreads by the late John Grant that may be of some interest to the readers of this blog
I learned only days ago that Carr wrote this short novel as a sort of first draft for what would become his first book publication, It Walked by Night (1930). I was pointed to it by the indefatigable Sergio Angelini, who, in a comment to a post on In Search of the Classic Mystery Novel, supplied a link to the novella’s online availability in two consecutive issues (March/April 1929) of the college magazine The Haverfordian: Part One begins here and Part Two begins here.
Keep reading the full review here.