A Killer Keepsake

I know it's a cozy mystery, but still, some research and a dose of realism would be nice.
A person telling an abused wife to go to the police in 1937 is not very likely, but I could live with it for the sake of the story.
A Jew in 1937 Berlin telling anyone to go to the police is much harder to accept.
A Jew in 1937 Berlin telling an abused wife... There I can only sit and shake my head. It's just a detail from the background, but very jarring.
And the main story has not been very engaging, possibly because of the victim being one nasty person we have just met, so no attachement there; and nobody we care about is in fact involved, other then Molly nosing around as usual when she was meant only to sit on the interviews.