What will the twins get into next? A man with no face, appearing out of the darkness. Outside Pittsburgh, Pennsylvania where they are surrounded by kids their own age. They handle it well, except when they don't and then lines are drawn between cliques, groups, and individuals. The twins have to power through the drama to get to the truth, and a strange tale it is that unweaves beneath their hands. Grace and Henry Warner return with a new folder for the monster case files, a file soon to be filled with clues, facts, and guesses. Join the twins on their journey through a life of travel and mystery with parents who believe in them, as long as they aren't completely sure what the twins are up to.