Whiteout (Orca Young Readers)

Robin can hardly wait for her cousin April and her Aunty Liz to come to the ranch for Christmas. When a devastating car accident sends Aunty Liz to the hospital for several months, Robin can't help but be overjoyed to learn that April will live with Robin and her family while her mother is recuperating. But April has changed, and Robin must deal with April's growing anger and resentment at being forced to leave her injured mother and her life in the city. Then Robin's little sister, Molly, disappears during a blizzard, and Robin and April's friendship faces the ultimate test.