For a regular investigator, reaching this stage of the inquiry is already the limit, as the only leads available have been exhausted, and further investigation is impossible.
But for Leonard Ethan, it's a different story. To him, the [Identification (R)] Card is extremely effective in situations like this, especially when he can determine the specific time when the events occurred.
So after activating the Card, Leonard quickly saw many things through those two guns. It appeared that they had checked into a small village and then fell victim to something.
From their initial interactions with the villagers, it seemed they were quite familiar with the people in the village, which allowed them to comfortably stay there.
However, from the later developments, it's evident that the food given to them by those villagers must have contained some kind of psychedelic drugs, leading to their eventual abduction in an unconscious state.