You can now download The Mongoliad, a collaborative effort from Neal Stephenson, Greg Bear, Mark Teppo, and a few other authors, for only 0.99$ here.
Here's the blurb:
The first novel to be released in The Foreworld Saga, The Mongoliad: Book One, is an epic-within-an-epic, taking place in 13th century. In it, a small band of warriors and mystics raise their swords to save Europe from a bloodthirsty Mongol invasion. Inspired by their leader (an elder of an order of warrior monks), they embark on a perilous journey and uncover the history of hidden knowledge and conflict among powerful secret societies that had been shaping world events for millennia.
But the saga reaches the modern world via a circuitous route. In the late 19th century, Sir Richard F. Burton, an expert on exotic languages and historical swordsmanship, is approached by a mysterious group of English martial arts aficionados about translating a collection of long-lost manuscripts. Burton dies before his work is finished, and his efforts were thought lost until recently rediscovered by a team of amateur archaeologists in the ruins of a mansion in Trieste, Italy. From this collection of arcana, the incredible tale of The Mongoliad was recreated.
Full of high adventure, unforgettable characters, and unflinching battle scenes, The Mongoliad ignites a dangerous quest where willpower and blades are tested and the scope of world-building is redefined.