This is a great book and one which lasts and lasts. Currently, it spans all three of my children (that's 2-7) because the story itself is fairly simple and yet there's lots of extra depth in it that keeps it at the top of an older child's favourite list too. The essence of the story is simple - Dougal dives down deep in a wonderful submarine and finds Atlantis, a magnificent busy city of the merpeople. Every page is bursting with fantastic colourful and exuberant illustration. There's plenty to spot: mermaids, sharks, submarines and over 100 different kinds of fish as well as hints of the Man in the Moon (another cracker by the same author) with a couple of aliens, and the tiniest rocket in the sky. There's a droll humour throughout, much of which is based upon Dougal's oblivious nature - he thinks the sharks are lurking as they want his salad, and doesn't see anything interesting as he dives between underwater dinosaurs. The way the story is written is more advanced than Man in the moon - however, my two year old doesn't seem to mind at all that some of the text is structured 9 a.m. did this, noon did that etc. and my eldest rather likes following the time frame through the week. So if you're after a fun and imaginative book to inspire your children, you'll be well pleased. I just hope Bob (Man on the Moon) and Dougal come from a large family -can the next cousin be a Polar explorer please?