The doughnut ring - Alexander McCall Smith

Jim and his friends are upset to hear that their school janitor's car has been stolen, and just before he's due to retire too. So Jim comes up with a bright idea for a way to help raise money to buy a new car: selling doughnuts.

They start by making their own very delicious doughnuts to sell, but run into problems when demand exceeds supply. That's when Jim has another brainwave and decides the only way to make enough is to write a chain letter asking people to make more doughnuts. The doughnuts start rolling in ... and rolling in ... and soon Jim is up to his ears in them. It takes another inspired business idea to rescue a situation which is rapidly getting out of hand.

This is the inspiring story of a boy with a big heart and big business ideas, from bestselling author, Alexander McCall Smith.