The Grey Sisters - Jo Treggiari

D and Spider have always been best friends, and they are further united in their shared grief: they both lost siblings in a horrific plane crash two years earlier. A chance sighting of a beloved cuddly toy in a photograph of the only survivor raises D''s hopes all over again that somehow her sister survived. She and Spider and their friend, Min, set off on a road trip to the mountainside site of that terrible crash.