It is a really good book with a lot of imagination. There are three books in the series the crooked sixpence is the first. If you advent read the book and you don't want any spoilers don't read the rest of the review. When Ivy and Seb come home they find a feather writing on the wall, it writes ''we can see you now'' this starts off a amazing adventure into the under ground trading city of Lundinor where they only have two days to save there parents.