First off, to all of you hidden object game fans, this is one you are going to enjoy. I'm sure you've already hit the download button above, and you'll be glad you did.
The rooms are what you would expect from a good quality game of this type, and the hidden objects vary from being relatively obvious to very deceptively concealed - often in plain sight. For the occassional almost impossible to find object there are limited hints per round that will point them out for you ("oh there it is!)
Apart from the random objects in each room to find, there are also some variations on the theme where you need to pick objects up and place them in the right location.
Since this game is a murder mystery, the reason you are looking around these rooms is of course to find clues to help solve the crime. So some of the objects you pick up are also clues that you'll be working on in the between level puzzles - of which there are several.
But, finding clues and putting the pieces together is only part of it. You also need to interview the various subjects as you find these clues. This process is more a case of playing a preset conversation between Poirot and the suspects than actually interacting with them and choosing an approach to take (as in law and order).
Still, you'll need to play close attention to the clues and the conversations if you hope to put everything together. If you've played Bedazzled you'll have an idea of the sorts of interactions you'll need to keep in mind if you want to solve the mystery.
All in all a very good game, with lots to like about it.