Ah... Well, I'm not really one to investigate murders, since it's not a problem that afflicted my people, for one, and even after awaking, investigating actual murders was incredibly straightforward.

[ No one cares that much to hide murders when you're all sinners tbh ]

But if I'm to treat it like my traditional research... Hm... The most obvious or interesting first, and then doors will be opened from there. Proverbially. It is all a matter of pulling at implications to find something less obvious to pursue.