"Jack and Annie travel in the magic tree house to Galveston, Texas on September 8, 1900--the day of the worst natural disaster in US history"-- Jack and Annie are on a mission! When the magic tree house whisks them back to Galveston, Texas, in 1900, they find out that a big storm is coming. But even though there is rain and wind, no one believes there is any danger. As the storm grows, seawater floods the city. Now everyone needs help! Jack and Annie have a little bit of magic and a lot of hope--but will it be enough?