I'm not sure if you like the X-Men, but you do like Marvel, so I'm going to go ahead and recommend Wolverine: The Long Night, it has a murder mystery feel to it, Wolverine is central to the narrative, but you are not following him, you are following two detectives who think that Wolverine may be responsible for a heinous crime. Anyways, there is a second season, I'm afraid I haven't listened to it, but my understanding is each season is its own contained story.
Audio Drama Rec