I just finished The Dragon's Tooth by N.D. Wilson. It is the story of two brothers and a sister who think they have lost everything. When a mysterious stranger appears and they find themselves part of a secret order of explorers who have long served as caretakers of the world's secrets, keepers of powerful relics from lost civilizations, and jailers to unkillable criminals who have terrorized the world for ages. If you liked Harry Potter, Spiderwick, or Percy Jackson, you will probably like this adventure. Be warned, this is book 1 in the series, and you will be left wanting to read book 2, which we don't have yet!!