I'm finding it difficult to get my idea translated into a suitable novel. It's about a girl who lost her parents to WWII even though they were peaceful. She is an american but her parents had relatives in Germany who were sick and went to see them before America entered the war. After that they were not allowed to leave the country and ended up dying in the Berlin bombing. I have the idea of how I want it to end and the basic plot but I'm having trouble expanding on my original idea. Any tips?