Two days before school ended, Dumbledore was killed by Snape. Harry had foreseen something like this was going to happen, so he did what he knew to be best; hide. He slipped away from the train station, and instead of leaving with the Dursleys, he left for a small beachside property he had inherited from Sirius that almost nobody knew of. To be safe, Harry kidnapped a Japanese muggle tourist to use him as a secret keeper. In theory, it would work, and it did. He easily cast the Fidelius charm, something which he had researched extensively after the revelation that Dumbledore was dying. He secured the secret on a few slips of paper, which he decided to keep safe in the safe-house and obliviated the memory of the last hour from the tourist. Since the secret was hidden in the soul, he wouldn't need to remember it. In a week, the muggle would be back in Japan, blending in among more than one hundred million others.