The Mystery of the Missing Pop Idol

It's a big day at the Silver City Mall, where hundreds of people are lined up to audition for the show Pop Star Sensation! The Aldens are in line, too, because Violet wants to meet one of the judges--her favorite pop star, Madlynn Rose. But just before the show starts, Madlynn vanishes! Can the Aldens track down the superstar before it's too late?