The magical treehouse is back. With a mysterious message and enchanted baseball caps, Anne and Philipp travel to New York in 1947. With the help of their caps, the two transform and become part of an unforgettable baseball game. Anne and Philipp soon realize that this is no ordinary game, but a legendary sporting event. However, when Philipp loses his magical cap, their mission is at risk of failing. Join the journey in the magical treehouse! Mysterious adventures in foreign worlds and long-lost times await you in the other volumes as well. The popular children's book series by bestselling author Mary Pope Osborne. Siblings Anne and Philipp travel through time with the magical treehouse. They experience thrilling adventures, discover distant lands and fascinating animals, and meet many famous personalities.