Robin McKinley! I like all of RMcK's retellings, but she wrote one that is simply flawless: Deerskin, which is a retelling of Allerleirauh/Donkeyskin. It's at once a successful novel on its own terms (perhaps the only RMcK novel that has an ending?) and has that almost ficcish quality of more-than-the-sum-of-parts intertextuality. Without "subverting" or negating or ignoring what makes a fairytale a fairytale, it also makes a convincing and moving novelisticpsychological portrait of the protagonist of a fairytale. It's grounded and magical at once in a way that authors often try but rarely succeed at to such a degree.