If you have read the other books in this series, and even if you haven't you have got to read this book... In it Caitlin and her new friend, Lilly, get lost in an abandened silver mine when they go on a feildtrip for school. They have to figure out wether or not the mine is haunted or not, before whatever lurking in the mine 'gets' them. It's an awesome read, for a person who likes mysteries.
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