"It was only for a moment, something she needed to pick up for Lucius," she answered.  Narcissa had also wanted to introduce her to Mr. Borgin – as Lady Yaxley – but he didn’t need to know that part.  "I think you’ll understand when you open it."  Glancing at her curiously, he cautiously tore the paper away and revealed a handsome leather-bound antique edition of Moste Potente Potions.  "I know you probably already have a copy of it downstairs somewhere, and you probably also know most of the recipes, but... I know your thing for old books, and I’m fairly certain this is a first edition."