This is a classic old-school style point-and-click adventure with some quality graphics, superb voice acting, and a brilliant orchestral soundtrack. It has a strong nostalgic feel of a Poirot / Pink Panther whodunnit.
My one criticism is that the puzzles are pretty simple - sometimes you feel you are just clicking things for the character to reveal the story. However, the atmosphere and superb voice acting will keep you hooked in, and it's worth sticking with it to the end to reveal the true identity of the "The Raven" - the mysterious, shadowy character you chase through the game.
The pace is quite slow - but in a nice gentle way. It's a perfect chillout game for the mature adventure gamer on a lazy Sunday afternoon.