"Do you really wish to know?"
Spoilers from the books and/or games to follow!
The Rocking Horse was once a well kept toy store in Beauclair's Beauclair Port district. However, after its owner fell into money troubles, it was closed by the authorities.
Dettlaff van der Eretein, knowing it was abandoned,then proceeded to use this store as his base of operations.
Associated quest Edit