Johnnie Jacobson and his new friends determine to find out what is going on at the barn on Gun Lake. First there is an explosion. Then an arrest is made that shocks the quiet town of Gun Lake. A disturbing discovery sends Johnnie Jacobson and his friends on yet another adventure filled with schemes, action and mysteries to solve. Book Four Johnnie Jacobson starts school at the end of a busy summer and once again has to prove himself.
School proves to be challenging.
And then a secret football play, a museum mystery and a field trip to the Chief Noonday Trail put Johnnie and his Gun Lake friends hot on the trail of another exciting adventure.