Agatha Parrot and the Heart of Mud — Kjartan Poskitt

First, Martha's mom bans her from playing soccer, and Agatha and friends must get Martha back on the field. Then Agatha's brother, James, receives an email from a mysterious girl, Bella, and Agatha secretly responds for him. It's just one of those things that sisters have to do!
     Agatha discovers Bella's love of spelling might hold the secret for getting Martha permission to play soccer again. Several forged emails -- and a few spelling tests -- later, will Martha play in the big game? And what will happen when the innocent Bella meets the real James?
     The irresistible adventures of Agatha Parrot continue in this funny and unpredictable installment.