Any recommendations for detective thrillers or overall just mystery involving supernatural (or just horror in general) themes?

So I am a huge fan of Preston & Child's Special Agent Pendergast series - Overall, I really enjoy the character dynamics in a lot of their books and I do enjoy how they mix the book's detective background with more occult themes (or like in Relic/Reliquery and Still Life With Crows which have an almost inhuman element at play.) I will also say Stephen King's The Outsider was another one which I had found to be a good read as well. So I was curious if there were any novels or series which you could recommend that may be similar in aspect.