While anticipation ran high last week over the pending release of the last Harry Potter novel, Lilly Library children’s librarian Kim Perez quietly had her hands on three copies of the book.“I feel all powerful,” she said on Thursday, two days before the Saturday release. “I could blow the lid off the whole thing.”But of course she didn’t.The books arrived at the library on Tuesday while Perez was home for lunch. When she came back, the rest of the library staff jumped all over her, she said, and they opened the boxes with the precious books inside.When she ordered the books it came with a list of conditions and prohibitions to keep it off the shelves until Saturday, but it didn’t say anything about librarians not being able to sneak a peek.So Perez grabbed a copy, sat at her desk (hiding the book as best she could), and flipped right to the back of the book to skim the last few chapters to find out who dies in the end.After that, the books were kept in a safe place until Saturday, when they went right to the first three patrons who reserved the book back in the winter. Others on the waiting list may not see the book for quite a while. There are more than 300 Potter fans on the list already, Perez said.