Ada Mullins


 * For unicorns, see separate article.

Ada Mullins, aka. "The Unicorn" was a cockney master thief who was responsible for a number of jewel thefts at country houses. She assumed the identity of Robina Redmond, 'the absolute hit of the social scene', in order to stay at Clemency Eddison's house. The Unicorn went after Clemency's Firestone, but was foiled by Agatha Christie; however, in all the confusion, she escaped and travelled back to London. (DW: The Unicorn and the Wasp)


 * The Unicorn's real name was never revealed on-screen, only in REF: The Time Traveller's Almanac. Robina Redmond may or may not have existed, apart from as an alias of the Unicorn.