Olivia was an orphan up until she turned 8, when she was adopted by a family and taken to live in Australia. She left behind a few friends when she went - not that any of them remember each other. But now Olivia is back, and moving into 221C Baker Street, and someone on the sidelines has something to say about the lack of memory. SherlockXOC Sherlock/OC, Season 2, pre-Reichenbach.