Robina Redmond
From Tardis Wiki, the free Doctor Who reference
Robina Redmond was the absolute hit of the social scene whose identity was assumed by the Unicorn, a master thief. The fake Robina Redmond went after Clemency Eddison'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)
