Christina and Grant start in New Orleans, while their friends start in Minnesota. Their plan is to meet at the St. Louis Gateway Arch, but on their trip, they get involved in a strange mystery that takes them to many sights along the mighty Mississippi River.
My grandchildren, ages 7, 8, and 10, all love this series of mysteries. It teaches them a lot about history and geography. They love to follow the same characters as they visit all these places in the US and all over the world. It also makes them want to travel to see these places!
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