Living in the boonies, one must give great consideration to how they will get around when they turn 16. Isaki has just turned 16 and his choice of transportation is his neighbor's Piper Cub. It might be old, but it flies well. One day he decides to fly over the 2,000m-high Ogusu mountain range to see the tower his neighbor is always talking about. But for some reason his plane feels too heavy and is using fuel faster than planned. Will he make it to the airport or crash in the bushes? And just what was making the plane feel so heavy?
