The Wolf of Ennerdale

Boisterous Uncle Bill comes to town, bringing trouble withhim in the form of a brutal mercenary tracking a diamond smuggler. With their ESP and deduction skills, Mae andIsla find themselves caught up in an international terrorist plot involvingtheir parents' workplace, risking a nuclear catastrophe that could destroy themall. Can they work out the purpose of a peculiar device they found before it'stoo late?