When the Church of the Invincible Sun is looking for someone to do its dirty work, they call on Sister Svangerd and her priest. Stealing a book might sound like a relatively simple task, but this isn't any old book.

To get their hands on it, they must impersonate a legendary figure, create the world's most expensive letter of introduction, and sneak into the most heavily guarded library in the world. All in a day's work, but the machinations of the mysterious Loyal Opposition threaten to derail their best-laid plans.