Is there a "how to" for Murder on the Orient Express?

I am stuck on a level, plus don't really know the 'why's, how's and wherefore's' for maneuvering this game. Is there a downloadable walk-through or something?

There's a Walkthrough at Gameboomers but good luck. I followed it and am still stuck!!! Cheers, Fran

Thanks. I guess it will be worth a try anyway!