Katherine Noll

Aly and AJ are psyched to star in a music video with the country music sister act the Walker Sisters. And what's even better is that the video is set to premiere at the National Music Awards in Nashville. But after the filming is done, the digital files for the video disappear. And there's no time to reshoot! Aly and AJ are on the case. Will they be able to wrap up the mystery in time for the big premiere?