Sophie George lives with her father in the small town of Orchard Mead and works after school at their post office. She enjoys delivering the mail around the town, mainly because she likes to draw funny pictures based on some of the weirdos that live here. But lately, it's not just the locals who have been acting strange - her Dad has been acting pretty weird too!

Sophie's friend Janice is convinced he's a spy, but Sophie thinks that is ridiculous. However, the deeper they dig into her father's life, the more confused Sophie becomes. The evidence all seems to add up: the mysterious phone calls, a Russian connection and a mysterious note.

Could Janice be right; is her Dad really a spy?