The Seven-Carat Conundrum

"Conspiracies swirl around the king of Oublie Toire, a French colony forgotten and abandoned during the chaotic Revolution. For two and a half centuries, Oublie Toire has thrived in isolation, inventing groundbreaking scientific discoveries to transform its desert terrain into fertile land. The kind of discoveries people kill for. Now, the island wants its independence… while France has never had more reason to hang on to it. The rumors about the king could give France the leverage it needs to destabilize the delicate treaty he has negotiated, and only the prince and the mysterious crown jewels stand in the way of a total collapse of negotiations. But soon, [Sarah & Simon} uncover an even greater threat, one that no one else suspects."