The Girl with the Red Balloon is a historical fantasy novel written by Katherine Locke. The story follows Ellie Baum, a young girl with red hair, who accidentally time travels to 1988 East Berlin while holding a red balloon. As she navigates the dangers of a divided city and uncovers family secrets, Ellie must find a way back home. This captivating blend of history, magic, and romance offers a unique perspective on the Berlin Wall and the power of hope.