Big Biscuits. Morris Gleitzman

1 boy. 1 girl. 1 camel. Squillions of dollars. A plan that can't fail. Or can it? Oliver's parents own a bank. This makes them very rich, very important and very busy. Oliver, on the other hand, is terrible at maths and aspires to nothing more than owning the puppy that he frequently visits at his local pet shop. When a mysterious woman buys the puppy and threatens to harm it if Oliver can't return her thousand of dollars (unfortunately, Oliver's parents seem to have misplaced her life savings. Something to do with some stuff on the news.) Oliver hatches a plan which will take him further than he ever imagined...