There is a great deal to this little story, including great description, what I'd call sublime horror, and a rather large dose of social commentary on the time it was written.
Be advised, however, that this story was written in the early 1930's using the literary style of that period. It was a time of great social change, and the concept of science not being able to solve all problems was really being driven home. Fear that the world was becoming a darker place was growing and the future was looked upon with gathering dread. With older works of art, one should recognize that fears tend to change somewhat. Yet Lovecraft knew about the kind of fear that never ends, that corrodes the soul, that destroys lives.
Listeners who wish easy prose and fast action should probably pass on this.
Yet if you appreciate very well written, thoughtful, and suspenseful in the classical sense sort of prose, this little novella is for you.