When 17-year-old Maddy Andrews discovers her seemingly perfect new stepsister has a sinister dark side, she must find a way to protect herself, and her mother–or risk becoming the latest in a long line of victims.

In 1944 Poland, a Jewish shop keeper named Jakob is summoned to ghetto headquarters after being caught out after curfew. While waiting for the German Kommondant, Jakob overhears a German radio broadcast about Russian troop movements. Returned to the ghetto, the shopkeeper shares his information with a friend and then rumors fly that there is a secret radio within the ghetto.