Seeking a non-cliche book where the narrator may be entangled in some crazy conspiracy/messy situation OR may be in psychosis

I want to read a truly nuanced and non-cliche book where you’re not sure what may or may not be real – As in, the narrator is in some crazy situation but due to their family history, personal history, or some other reason, there’s tension about what is or isn’t real. The tropes of “oh, [...]