John and Jack are mystified when they discover a cryptic warning on a medieval manuscript--a warning that is not only addressed to them, but seems to have been written by their friend, Hugo Dyson. But before they can discover the origins of the book, Hugo walks through a door...
John and Jack are mystified when they discover a cryptic warning on a medieval manuscript--a warning that is not only addressed to them, but seems to have been written by their friend, Hugo Dyson. But before they can discover the origins of the book, Hugo walks through a door...