Third installment of an adventure series a la National Treasure.I thought there was enough info given about the previous books to warrant this being a stand-alone novel.Although the whole plot is centred around the two young sons of the main characters being kidnapped, they seemed to forget it a lot. The parents would be so engrossed in their treasure hunt that the two boys became an afterthought. That aspect of the storyline felt insincere. Then again perhaps I just felt that there was a complete lack of concern missing on the parents part.Every tight situation had a covenient solution and the ending was a little picture perfect. It was an ok read.Plenty of potential and with a little more depth it could be a cracking one. I received a free copy of this book via NetGalley.