Mystery Book Series for Children by Yang Xiangying: Yuan Yuans Birthday Secret (Chinese Edition)

Every time celebrating Yuan Yuans birthday, her mother was always sad. She asked grandmother and her future new dad for the reason, but they both refused to answer. She was told her father died many years ago. But she became more and more confused while growing up. One day, she determined to find out the secret. With the help of her friends Tao Tao and Tong Tong, she found out her real father was still alive and was fighting for her custody.