Orpheus: A Song for Ella Grey, by David AlmondRead about the other entries on the list.
Ella and Claire are best friends. Then Ella falls in love with Orpheus, and it’s like Claire has lost her. Their love is overwhelming and immediate, and it’s all Claire can do to stand by and watch as her best friend leaves her behind. And then Claire actually loses Ella, and Orpheus is set to go to hell and back (literally) to save her. A Song for Ella Grey is a poetic retelling of the original myth, so be warned: do not expect a happy ending.