I first read this book nearly 15 years ago, when I was a young lad alone in my dusty school library, with a few hours to kill and not much of a selection to choose from. I had a morbid fascination with ghosts and the undead, and the title stuck out (I'd love to say that the book levitated into my waiting hands, but I've never met any bookworm poltergeists).
This is a really charming story about an unusual family trying to find their way to a new home. From a child's point of view, the book's outlook is perfect - the monsters are lovably human, while many of the adults are selfish and arrogant - and there is never the sensation that the book is being patronising or dumbing things down for the sake of the young readers.
I've recently bought a copy for nostalgia value, and when I have children I hope they'll find it interesting...though no doubt they'll be hooked (booked?) on the next, post-Harry Potter craze.