Susan is worried about her mum. She's struggling with long hours at her job in the factory and it's a long time since they've heard from Susan's dad, who's on the front line in North Africa. Everything is in short supply in London, but Susan decides she's going to cheer her mum up by getting her a treat, and what could be more rare at that time than a sweet, delicious banana? But what lengths will Susan have to go to find one? Let Operation Banana commence!