A woman was taken captive by Voldemort more than a decade ago. she was young, only 16. It was after Trelawney had first predicted the prophecy about a boy born at the end of July and the The Dark Lord. The woman had started having visions, visions of the boys future. Each vision she had got farther and farther into his future. Voldemort took her captive because of her power.
If you read this story, you witness the last of The Seer's life.