Petrarch's Library can dock at any library in the world and at any time in history. This amazing, jumbled labyrinth of a library is so vast most librarians ride bicycles through the corridors--and watch out for the endangered auroch roaming halls! Dorrie wants nothing more than to put her Renaissance Fair sword-fighting skills to real use and apprentice with the society. But when a traitor arises, Dorrie and her friends are suspects - and the passage to Petrarch's Library may be closed to the 21st century forever.