Karen Tintori thought she knew her family tree. Her grandmother Josie had emigrated from Sicily with her parents at the turn of the century. They settled in Detroit, and with Josie's nine siblings, worked to create a home for themselves away from the poverty and servitude of the old country. Their descendants were proud Italian-Americans.But Josie had a sister nobody spoke of. Her name was Frances, and at age sixteen she fell in love with a young...