Summary

alperkins
When four kids take an unusual puzzle-and pass- they find themselves working alongside a brilliant man named Mr. Benedict, who is determined to save the world from an evil Sender. The children are put into the middle of the danger when they have to go into the very lair of the Sender himself. The outcome is sketchy, and the danger very real. Only by their quick wits and amazing talents do they overcome the enemy, at least for the moment.