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Sherlock had been investigating the doctor for a while now. Something about him intrigued Sherlock, hell, it all intrigued him. There were thousands of reports of him appearing in different points in history, not ageing a day and it wasn't possible. Impossible, that's what made it interesting. Nothing had occupied Sherlock like this, and the more he found out, the more uneasy he felt. The more he felt like he was being watched. And when a strange client came in asking for help to find something valuable, Sherlock took up the case not knowing where it would lead him.