A Sister's Promise — Anne Bennett

Molly's life changes forever when her mother is killed in an accident. Although her beloved grandfather wants to keep her and little brother Kevin with him in Birmingham, the authorities decide it's best for the girl to live with her maternal grandmother on a farm in Donegal. So Molly is packed off to Biddy Sullivan, who's a hard, cruel woman who loves to bear a grudge. When war breaks out Molly, fearing for her grandfather and ten-year-old Kevin, sets out for her home city, little guessing what perils are to befall her before she can discover her brother's fate.