"Are some secrets better left buried? As Amy and Dan track the next clue to a remote corner of the world, they make shocking discoveries about the source of the Cahills' power and the mystery of their parents' deaths. And as the threat of the mysterious Madrigals grows real, one of the clue-hunters makes the ultimate sacrifice. Amy and Dan have to decide how much they're willing to risk, and what they are fighting for. Can they avenge their parents...

An escalating race to find the 39 Clues finds Amy and Dan pursuing a Clue guarded by thousands of the world's best-trained soldiers, an effort that separates them in explosively dangerous ways.

Amy and Dan Cahill's quest to find the million dollars takes them to Vienna, where they must outwit their power-hungry relatives as they seek to solve a clue involving Mozart.

Unable to return to their normal lives despite the end of the Clue hunt, new Madrigal leaders Amy and Dan anxiously prepare for a retaliatory strike by the Vespers, who kidnap a number of Cahill family members and demand that Amy and Dan steal a famous painting.

When Iranian-American Kamran Smith learns that his big brother, Darius, has been labelled a terrorist, he sets out to piece together the codes and clues that will save his brother's life and his country from a deadly terrorist attack.

From New York Times bestselling author Jennifer A. Nielsen comes a thrilling World War II story of espionage and intrigue, as one girl races to crack a coded message to save her father and the French resistance.

Six hundred and fifty-seven days ago, Meg Kenyon's father left their home in France to fight for the Allies in World War II, and that was the last time Meg saw him. Recently, she heard he was being held prisoner by

...

Amy and Dan Cahill have their final confrontation with twisted billionaire J. Rutherford Pierce, a man whose power has no limits and is one step away from being elected president.

"SHADOW is really making waves and now the coral reef is in hot water. Special Agent EJ12 could be in over her head, but she must stop SHADOW before it is too late. That's the easy part. As EJ12, Emma Jacks can do anything. So why is she so nervous about the school swim meet? Perhaps she isn't after all..." -- From back cover.

"There is a spy at SHINE's top-secret training camp. But who is it? Special Agent EJ12 must not drop the ball. She must find the spy - and the missing invention. That's the easy part. As EJ12, Emma Jacks can do anything. So why is she worried about trying out for the soccer team? Perhaps she isn't after all..." -- From back cover.

"SHADOW is up to something with the water supply, but what could it possibly have to do with the filming of a new action movie? Special Agent EJ12 needs to keep her eye on the big picture. She needs to infiltrate the movie set and stop SHADOW before it is too late. That's the easy part. As EJ12, Emma Jacks can do anything. So why is she getting worked up over the little things at home? Perhaps she isn't after all..." -- From back cover.