This is what you should do with the story
Voldemort discovers that Harry is in Malfoy Manor by an anonymous tip-off that turns out to be Astoria and her sister, and they devise a plan to torture and kill Harry and Draco and to find the other horcruxes to bring Voldemort back to power. These meeting were hidden from Draco. Draco was walking around Malfoy Manor when he overhears most of one of the meeting about killing Harry and himself. Draco tells Harry and they devise a plan to escape Malfoy Manor, and to stay at a house Draco owned and kept hidden from his parents and everyone else (idk how, you can write that).
If you need more, just ask. And you're welcome. It was a pleasure to write this