It was supposed to be the summer of her life. Instead, 17-year-old Lucy finds her best friend Harper shot dead in an LA swimming pool. How did it come to this? Lucy Gosling is the drummer in Crush, a rock band formed by five London schoolgirls that has just won the UK semi-final of an international talent contest. But when the band lands in Hollywood for the big final, things are not quite as they seem. The band's lead singer, Harper, has just one thing on her mind - using sex, drugs and rock and roll, not to mention Crush itself, to win back her bad-news ex-boyfriend. Lucy must decide whether she's playing to Harper's tune, or setting the rhythm for the rest of the band.