Goldengrove by Francine Prose

This tender novel is narrated by a thirteen year old girl named Niko whose older sister, Margaret, drowns in pond as the book opens. The title comes from Gerard Manley Hopkins's Spring and Fall (which begins Margaret, are you grieving/ Over Goldengrove unleaving?) Niko and Margaret's father is a bookseller, which makes the connection even more interesting when Niko finds the poem in a book in his shop and tries to use it to explain her pain and loss.