Oh, how I love crazy mummy stories! I have read a mummy-featuring Goosebumps book before, and I loved that one as well. Who's Your Mummy features tons of Egyptian paraphernalia, a creepy castle, mummies (obviously) and bat attacks (and the mention of a bat cave - I was SO expecting a bat mobile but sadly this book wasn't blessed with that particular bit of awesomeness). With plenty of twists and turns and a solid Horrorland bit, Who's Your Mummy is one of the better books in the series.