Husband-and-wife team Adam and Eva Clark are a couple of high stakes Treasure-hunters. Their specialty is lost diamonds, big diamonds. Their passion and instinct for these expensive gems keeps them in hot water as they travel the globe following clues to another diamond. It seems they are never alone in their search, there is always some unknown force engaged in the same chase and always trying to beat them to the prized stones. Their most recent adventure finds them in pursuit of the 'Demon Star' a huge diamond that has been lost for centuries, however as usual they find themselves embroiled in a suspenseful tug-of-war between several other black-market diamond connoisseurs. Their journey takes them to Amsterdam, Washington DC, and Barcelona as they face these villains with cunning and boundless invention. Will they persevere? Let's hope so. Each new diamond hunt in this series leads to yet another exciting adventure for this husband and wife team. One filled with twists and turns as they resolve each conflict.