Doug Beyer, writer and creative designer for Magic: The Gathering, has created a new novella about Jace Beleren. The first act is called Return to Ravnica, The Secretist Part 1. 

From Mark Nolan:

"In this first e-book, fans follow Planewalker Jace Beleren as he returns to his adoptive home of Ravnica to find all of the guilds preparing for battle. In his journey, he discovers evidence of disturbing gaps in his memory and a series of assassins on his trail. He also tries to reconnect with an old friend, but when she turns up dead, he ends up embroiled in a mystery that implicates all ten guilds and an ancient secret. While battle rages on across Ravnica, Jace finds himself fighting his own battle, with his own challenges and obstacles."

There will be three parts total, and Part 1 is available for $1.99 at Amazon / Barnes & Noble / Kobo. A sample chapter is free to download at the following URL:

http://www.wizards.com/Magic/Merchandise/Product.aspx?x=mtg/merchandise/ebooks