We found 1 Reddit comments about Before the Poison: A Novel. Here are the top ones, ranked by their Reddit score.
I read something not too similar but definitely had something in common:
This guy buys a house, and starts unravelling the story of the previous owners. Told through his investigation and "journal" entries that are pretty much flashbacks the way it's written.
So your idea sounds great, but would need a lot of research and planning I think. You want to make sure your WW2 is convincing and realistic.
Also you have a whole week to start planning for /r/NaNoWriMo ! Smash out that first draft! (Disclamer: This sentance is lighthearted.)