Andi's sister, Bex, returns home with a secret.

Andi decides to keep the news about Bex from her friends.

When Bex allows Andi to stay up late and watch scary movies, Andi gets in trouble for the first time at school.

Bex decides to help Andi capitalize on her new found popularity by throwing the best house party of the year.

Andi is upset when she finds out Buffy and Bex are spending time together without her.

Andi decides to tell Jonah about seeing his girlfriend Amber with another guy at the park. Bowie arrives at the Mack's front door!