Again, this is rated as I would have done as a child, not as an adult. You can tell how much I adored these books by the fact that even now, 15 or more years later I still recall the exact reading order without having to check!
This is probably the weakest of the 4 books so far, but is certainly still enjoyable. As an adult the bounds of credulity are really stretched by this series, but for a child the adventures Mory and co get up to are on par with the adventures of the Famous Five or Secret Seven!