Gosick Wiki

 "Kuiaran the Second" is a professional thief and the self-proclaimed successor to the title "Kuiaran". She travels to Sauville to trace the location of a highly-valued stamp called "Penny Black", and poses as Avril Bradley to extract further information about it.

She is also famous for her interest in the supernatural, and is the creator of various urban myths like "The Thirteenth Step to Heaven" and "The Reaper Who Comes in Spring".