Girl Underground by Morris Gleitzman

Bridget wants a quiet life. Including, if possible, keeping her parents out of prison.

Then a boy called Menzies makes her an offer she can't refuse, and they set off on a job of their own.

It's a desperate, daring plan - to rescue two kids, Jamal and Bibi, from a desert detention centre.

Can Bridget and Menzies pull off their very first jail break, or will they end up behind bars too?

Sometimes, to help a friend, you have to dig deep.

With its themes of friendship, perseverance and the power of standing up for what's right, Girl Underground is a must-read for anyone who loved Boy Overboard and wants to continue following Jamal and Bibi's journey through the eyes of all new, but every bit as endearing, characters.