Part one of a great two-book diary series featuring Mary-Kate and Ashley as you've never seen them before. School's out for summer and they're off to a music camp. Remember Pop Idol? Well, this time, it's Mary-Kate and Ashley's turn!

Mary-Kate and Ashley are off to a summer camp with a difference. It's called Camp Rock `n' Roll, and it rocks! Everyone has to be part of a girl band and take part in a Pop Idol-style competition to find the winner. Mary-Kate is determined to be the singing star in her group but one of the other girls, Lark, turns out to be the daughter of a famous rock-star, and she's inherited his great voice. Sounds like she'd be way better than Mary-Kate but she's too shy to perform!

Meanwhile, Ashley can't even get the other members of her band to agree on a name, never mind anything else. This music holiday camp is turning out to be hard work!