Our Australian Girl: Pearlie's Ghost (Book 4‪)‬

It's 1942 and Darwin is under attack. While bombs are falling, Pearlie is doing all she can to save her beloved pets and help the wounded soldiers. But it's too dangerous to stay, and when Pearlie finally has to say goodbye, only the thought of being reunited with her best friend Naoko can cheer her up. But Naoko has a problem of her own: a ghostly mystery that will truly test Pearlie's newfound courage . . .