The fearsome foursome is back in the second installment of the New York Times bestselling series praised by Rick Riordan! The Mysterious Benedict Society is up against a new mission, significantly closer to home. After reuniting for a celebratory scavenger hunt, Reynie, Kate, Sticky, and Constance are forced to go on an unexpected search—a search to find Mr. Benedict. It seems that while he was preparing the kids' adventure, he stepped right into a trap orchestrated by his evil twin Mr. Curtain. With only one week to find a captured Mr. Benedict, the gifted foursome faces their greatest challenge of all—a challenge that will reinforce the reasons they were brought together in the first place and will require them to fight for the very namesake that united them.