Sally Brown is a student and she wants to be a teacher. She is working at Happy Hills in her holidays. Lots of people come to Happy Hills, to go on the rides and see the fun characters - and 'Have a Happy Day'.
Today is an exciting day at Happy Hills - Zapp the famous singer is coming to open a new ride. Sally is very excited because she loves Zapp's songs and she has all his CDs. he really wants to meet and speak to Zapp, but Mr Parry says, 'Stop talking and do some work!'
But then someone takes Zapp's new CD with his secret new song on it... and Happy Hills in not a happy place any more.