Safier's
28 Days: A Novel of Resistance in the Warsaw Ghetto is a harrowing historical YA that chronicles the brutality of the Holocaust.
Warsaw, 1942. Sixteen-year old Mira smuggles food into the Ghetto to keep herself and her family alive. When she discovers that the entire Ghetto is to be "liquidated"--killed or "resettled" to concentration camps--she desperately tries to find a way to save her family.
She meets a group of young people who are planning the unthinkable: an uprising against the occupying forces. Mira joins the resistance fighters who, with minimal supplies and weapons, end up holding out for twenty-eight days, longer than anyone had thought possible.