The emperor and the nightingale

I read The emperor and the nightingale, Usborne first reading, level 4 book.
One day the emperor heard of the existence of a nightingale.
He wanted to listen a nightingale's singing.
And if he found the nightingale, he put her into gauge.
One day a present was sent by someone, and the present was the unreal but beautiful nightingale.
He was very happy and the real nightingale was alone, and escaped...👻

I think that I want to listen a nightingale's singing.
From this story, the nightingale had a mysterious power for the emperor.