Toil and Trouble — Charlotte E. English

Having rescued an immensely valuable book from a long-lost library, Jay's joy turns to dismay when it proves to be unusually... chatty, and possessed of a fine, filthy vocabulary besides. What manner of enchantment created such a strange and powerful book is a mystery to the Society, but Ves is determined to solve it.

She's not the only one. The organisation known as Ancestria Magicka might be brand new, but they can more than rival the Society in power - and they badly want the book. But why are they so interested in its long-dead creator? When the mystery turns into a race to find a fifteenth-century grave, there's only one thing to do: call in the Toil and Trouble department...