Not surprising...
It's a hunt and peck 'minigame'.
You have to goto each area and click on stuff which doesn't show up highlighted or at all obvious. :-(
Once you have gotten as many as you think are there, you try to solve for who the culprit is, by selecting evidence on the final screen of it that has a list of all clues you found.
Do NOT select all of them.
This is the only thing I disliked from the last release!