Her last promise
(Book)

"Berlin, 1938. When Hanni's beloved sister suddenly vanishes in the middle of the night, Hanni knows her high-ranking Nazi father, Reiner, is not telling her the whole truth and may hold the key to her disappearance. Years later, after finally learning how to live with her troubled past, Hanni dedicates herself to raising her teenage son, Leo, but her sister is never far from her mind. But when Leo begins to share Reiner's pro-Nazi views and runs away from home to meet his grandfather, Hanni's world collapses in an instant. She is determined not to lose her son to her father's cruelty, like she lost her darling sister all those years ago... Hanni has tried to stop her father before and nearly lost her life. Now she is fighting for Leo too and the stakes are higher than ever. She can't lose him to the Nazis. She won't let her father take her son away from her. Hanni knows this is her last chance to bring her father to justice. With her son's life hanging in the balance, Hanni knows this will be her toughest battle yet. But with Reiner's popularity stronger than ever, will she succeed?"-- amazon.com