Morris Gleitzman's latest book, Too Small to Fail, features Oliver, whose parents own a bank and are very, very rich and very, very busy. Oliver, however, is terrible at maths and just wants the puppy he visits at his local petshop.

When a mysterious woman buys the puppy and theatens to harm it if Oliver can't return her life savings, which his parents seem to inadvertently misplaced, Oliver hatches a plan...

Speaking at the Edinburgh international books festival, Morris Gleitzman reads an extract from the book and talks to Michelle Pauli about some of the themes in it.

Read an interview with Morris Gleitzman

Listen to Morris answer questions about his last book, Grace