"Half Magic" is a children's fantasy novel written by Edward Eager. The story follows four siblings—Jane, Mark, Katharine, and Andrew—who discover a magical coin that grants wishes, but only half of what they truly desire. This leads to a series of humorous and unexpected adventures as they learn to navigate the consequences of their wishes. As the siblings experiment with the coin, they encounter various challenges and magical beings, including a dragon and a fairy. Through their experiences, they gain valuable lessons about friendship, responsibility, and the importance of thinking carefully before making wishes.