Nicholas Asquin

 was a member of Victorian era society. The Fourth Doctor and Percival Quick visited his house after a transmat beam had been traced there. The Doctor worked out that the was the Knave, a thief that stole things from locked rooms, and was transforming into an alien being using the transmat. He stole the Doctor's TARDIS. The Doctor later managed to reset the transmat and cure Asquin. (AUDIO: The Beast of Kravenos)