But I'm not just talking what people could do. I'm talking supernatural boosts to perception. As in, people cannot normally attain them.
Even Sherlock Holmes is human after all. Maybe replacing scholarship for investigation and a few more stunts to buff this.
If you want a "people cannot normally attain them" power, that would be supernatural senses all right. A dogs sense of smell, enhanced vision to pick up microscopic clues, extra sensitive fingertips to feel the smallest details, and so forth.
Or you could take a look at psychometry.