Caitlin Cassidy has found an old map in her attic that her great grandfather drew, outlining cannon believed left by Sir John Johnson of Johnstown, N.Y., a Loyalist, fleeing to Canada during the Revolutionary War in 1776. Caitlin brings the map to her friends and they attempt to find the cannon by retracing Johnson's route through the Adirondacks encountering the mysteries and dangers of the forest. Will the cannon give up its secret