Surprisingly, the phrase 'The Wolf at the Door' has been used by more than one writer, so there isn't a single author I can pin to the title without more context. Over the years I've run into that exact title on crime paperbacks, on melancholic literary novellas, and even in a few memoir-ish books that borrow the expression for atmosphere. Because it's such a evocative idiom, different presses and writers have slapped it on works that range from psychological suspense to domestic drama.
In my shelves I treat it as a flag that prompts me to check the jacket copy: is this a gritty noir, a historical piece, or a contemporary character study? Each time the title popped up it signaled a different tone — one felt like a thriller set in a rain-soaked city, another like a quieter, introspective book about family and scarcity. If you're thinking of a particular edition, the easiest way to know which writer it is would be to look at the edition or publisher details; the same title can belong to totally different authors and genres. Personally, I love that mystery of titles being reused — it makes hunting down the exact book feel like a mini-adventure rather than a straight fact-check, and it keeps bookstores exciting.