Anthea is a young woman who works as an assistant of Mycroft Holmes, the brother of consulting detective Sherlock Holmes. She is first seen in the limo which Mycroft uses to "kidnap" John for their conversation. She spends most of the journey texting on her phone, ignoring John. When John asks her what her name is, she replies with "Anthea" but admits seconds later that it was a lie. When Sherlock returns to London after faking his death, Anthea is seen briefly whilst Sherlock is in Mycroft's office and she returns Sherlock's coat.