"Alien Wind" by Klonowska-Szałek: Volksdeutsche grandmother and IPN files mystery

"Alien Wind" is Aleksandra Klonowska-Szałek's debut novel, in which a granddaughter breaks years of family silence by discovering a 1947 document bearing her grandmother Alicja Liedtke's name — daughter of a Volksdeutsche. The investigation leads through IPN files and postwar upheaval. The grandmother sets a condition: don't open the files, and I'll tell you everything.