Private Eye - walkthrough

Back in the day I was never able to beat the longest version of the game. It's the one where (I believe) we have 20 minutes to finish. I started to make a crude map at the time. But I got frustrated and gave up. I think I came real close to beating it at one point. But I think I needed about another minute.

So has anyone ever created a map or a walkthrough to finish it? 30 years later I'd like to finally beat it. Any help would be appreciated.

Thanks!