Weeks before the beginning of their Sixth Year at Hogwarts, Hermione Granger saves Draco Malfoy's life. Compelled to lie about it, Hermione's friendships become strained, and she finds an unexpected companion and confidante in Draco. Increasingly becoming the keeper of each other's secrets, they discover that truth and lies have little to do with trust.
Years 6 + 7, with Sixth Year roughly following plot of HBP, but a complete reimagining of Seventh Year/DH.