Clara and the Doctor receive a unusual distress call from a familiar planet and discover a malicious plan that is unfolding in the biggest library in the universe. But in order to save the day, the Doctor must revisit the planet's hard-drive and come face-to-face with the woman who changed his life - a woman he left, like a book on a shelf, without a goodbye.

This is story of River Song's life, starting as Melody Pond and continuing through Trenzlore. This is how she became the woman that the Doctor fell in love with and how she watched the people she cared most about know her less and less. This is her story. 11/River, Amy/Rory. Cannon through Matt Smith's era (or supposed to be). Rated T because it's River.