The Icklebies were ghosts that wanted to be free from their mausoleum and be alive again, but they were cursed so they couldn't get out. So, these kids opened a puzzle without realizing how much trouble they brought to themselves. Then their worst nightmare comes true.
I didn't really like this book. The other books in the series were more interesting and adventurous. This book didn't really have that. I think it was because it was his last book and he was running out of ideas. There were only a few things I liked about it. One of them was that he involved these funny aunts that are in their seventies.