Sirius Black
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Grim Dawn (Harry Potter) by Robin4
Prior to Harry's third year, he leaves the Dursleys, desperate to escape. But before the Knight Bus can stumble upon him, he encounters someone far different, and his world begins to change.
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A Study in Magic (Harry Potter/Sherlock) by Books Of Change
When Professor McGonagall went to visit Harry Watson, son of Mr. Sherlock Holmes and Dr. Watson, to deliver his Hogwarts letter, she was in the mindset of performing a familiar if stressful annual routine. Consequently she was unprepared for the shock of finding the cause behind Harry Potter's disappearance. BBC Sherlock HP crossover AU
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(1) Becoming (Harry Potter) by Unexpected Inspiration
When Sirius Black escapes Azkaban and 8-year-old Harry Potter disappears, the world is thrown into upheaval. What will Britain and Harry be without each other, and who will face the Dark? You only THINK you've read this before. I guarantee you haven't.