The murder mystery genre has been known to focus on detectives or police officers meticulously scourging crime scenes for evidence of how and why a murder was committed and by whom by employing grand feats of deductive reasoning. However, known to accompany a detective's logic is science, most notably forensic, but what if assume that rather than scientific rules being used to prove or disprove the validity of a witness's statement or to see new possibilities as for what happened, it were magical laws? Assuming this happens in a setting where knowledge of magic is commonplace, perhaps witnesses can claim to have witnessed somebody cast a spell to murder a victim, but how they claim the spell was cast, from where or how it was utilized doesn't add up with how the spell actually operates? Or, in a setting where superhuman abilities are common place and vary massively from person to person, be it in sheer nature, degree or breadth, these abilities act as a sort of "fingerprint", so if a murder is carried out using these abilities, perhaps they could utilize them in a way that makes it look like somebody else's abilities were used to commit the crime -- in a way, them using their abilities in a way that makes it look like no abilities were used in the committing of the crime, or making it look like a different ability was used, could be the supernatural equivalent of "wiping away your fingerprints". But it seems like they would be very short. It seems like once the "detective" figured out how the spell doesn't work like how a witness claimed it did, and then found out how someone else could've actually used it in that situation, it'd be way too easy, perhaps, to finger a culprit? Or perhaps the world-building could detract from the mysteries or vice versa? In what way could one find a balance of fantasy and murder mystery? World-building and mystery? How could clues be hidden in ways that don't make it impossible for the detective to figure it out? How would witness testimony even play into it? Would witnesses seeing what happened make figuring out the real culprit all too easy?