Sherlock holmes had gotten many strange cases since the start of his career. He learned not to be shocked by whatever crazy situation he and John manage to find themselves in. When Greg lestrade responded to a police call he didn't expect to find a sleeping blood soaked teenager with a bloody knife passed out behind a garbage bin. But what finally made him realise the type of situation he was in was when he checks for a pulse only to find her sharing a startling resemblance with the world's only consulting detective.