Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Story

Platform 13 in Kings Cross Station is unused, but noone will tear it down. Under Platform 13 is a gump, a secret opening to another world. The king and queen of that world have a baby who is kidnapped on a visit through the gump. Unfortunately the gump only opens once every nine years and then for only nine days. The royal couple sends a foursome of rescuers to find him at the next gump opening, but do they really want him back?This is a very well written and enjoyable story. The characters are wonderful and it is suitable for children of all ages.