The Mysterious Benedict Society and the Prisoner's Dilemma by Trenton Lee Stewart

In The Mysterious Benedict Society and the Prisoner's Dilemma, book 3 in the Mysterious Benedict Society series by Trenton Lee Stewart, the kids, Renny, Kate, Sticky, and Constance, are off on their third adventure.

This time, Mr. Curtain, the nemesis of their benefactor, the kindly Mr. Benedict, is after The Whisperer, his sinster contraption that he used to influence the minds of children and adults alike before Mr. Benedict took it to keep Mr. Curtain from using it again. But because of government interference and Mr. Curtain's sneakiness, he and his cronies capture it again. As well as the children! Will they be able to escape? Will their parents and Mr. Benedict come to their rescue in time? Read the book and find out!