Tired of being the middle sister, eleven-year-old Addie Asante uses a magical bracelet to switch places with her thirteen-year-old sister and discovers that being older is not necessarily easier--and worse, her baby sister is now living as Addie.

"An adopted middle child receives an unexpected package on an otherwise unremarkable birthday inviting her to join a super-secret division of the CIA"-- Provided by publisher.

Azaleah's older sister Nia is going to be the star of the school musical but things keep going wrong at the rehearsals (missing batteries, disappearing props, microphones that suddenly do not work); Mr. Guidi, the director, blames the ghost of Thespis, but Azaleah suspects that somebody is actually sabotaging the play--and she is determined to use her detective skills to uncover the culprit, and set things right so the play will be a complete success...

On a quest to become someone's favorite Ali-O'Connor, ten-year-old middle child Marina enlists Boom, her new neighbor, to help make a documentary about her, but when things do not go according to plan, Marina begins to wonder if she will ever feel like she belongs.

Charlie C. Cooper, reformed bully, gifted hacker, and middle child wants to make "cool" friends at her new school in Los Angeles, but her psychologist tasks her with becoming friends with the school's "biggest loser."