Ally has just stepped off a plane to spend a holiday with her pen friend, Nancy. From the moment they meet, they want to do absolutely everything together. In fact they feel almost like sisters and Ally's boundless enthusiasm turns whatever they try into a triumph. By the end of the week the two girls have danced together, shopped together, roller-skated together and lost count of the tubs of ice cream they've shared. They're closer than ever so it's really hard to say goodbye. But Nancy and Ally refuse to let their spirits be dampened, after all, 'sisters are together, even when they're apart!' Angela McAllister's laugh-out-loud story and Sophie Fatus's sunny pictures create a real celebration of friendship for little girls (and reptiles) everywhere!