I was disappointed with this book mainly because it was much, much shorter than the original and so there was little or no suspense or build up. All the atmosphere of the original was lost. The illustrations have none of the drama of the cover art and don't look like any attempt was made to capture either the atmosphere or the time period of the story.
The story itself is incredibly clever, and Agatha Christie's original work is an incredibly exciting read. Buy a proper prose copy and leave this one well alone.
It is a shame, because converting a story to a graphic form can really add something to the experience of reading it - this book just took away.