if you liked the dresden first book, you might like the Garrett PI series by Glen Cook.
As far as my series to offer the thread, the Gap series by Stephen R. Donaldson. If you think of thomas covenant when you see that name, I promise that this series is another animal all together, though the first 2 of 5 or 1 of 4 books does feel like something of a psychological disorder series at some points. In any event, I couldn’t have ever guessed that the gap series and the first 6 covenant books were by the same author.
re OBJECTIONABLE CONTENT WARNING for the gap series first 1 or 2 books (1 of 4 or 1-2 of 5) = these stories have some fairly heavy and unpleasant themes of abuse.