I know I've been lukewarm on 39 Clues books in the past, but they haven't been much to brag about. Until now. I've no doubt that the credit goes to Rick Riordan (who wrote the overall story arc of this series) for the increasingly interesting and suspensful plot twists introduced in this book. I've always loved the mix of history, fiction, mystery, and travel in this series, and now I think I'm hooked. There are 6 more books to go (one being released every three months) and I'm ready, waiting, and excited to read them all.