NOTE: This novella is included within Arcanum Unbounded: The Cosmere Collection, now available in print, ebook, and audiobook from Tor (US/Canada) and Gollancz (UK/Commonwealth).

Mistborn: Secret History is a companion story to the original Mistborn trilogy.

As such, it contains HUGE SPOILERS for the books Mistborn (the Final Empire), The Well of Ascension, and The Hero of Ages. It also contains very minor spoilers for the book The Bands of Mourning.

Mistborn: Secret History builds upon the characterization, events, and worldbuilding of the original trilogy. Reading it without that background will be a confusing process at best.

In short, this isn’t the place to start your journey into Mistborn. (Though if you have read the trilogy—but it has been a while—you should be just fine, so long as you remember the characters and the general plot of the books.)

Saying anything more here risks revealing too much. Even knowledge of this story’s existence is, in a way, a spoiler.

There’s always another secret.

**

From Publishers Weekly

Sanderson's eerie second fantasy (after 2005's Elantris), set in a mist-haunted, ash-ridden world, pits Kelsier, "the Survivor of Hathsin," against the immortal Lord Ruler's 1,000-year domination of both the Great Houses and their serflike "skaa." Through Allomancy acquired in the Ruler's most hellish prison, Kelsier can "burn" 10 metals internally, fueling superhuman powers he uses to assemble rebels in a loose plan to destroy the nobility, the empire and the Lord Ruler himself. Kelsier uses Vin, a street urchin with the same Mistborn powers Kelsier possesses, to infiltrate the Great Houses' society, where she falls in love with philosopher prince Elend Venture. This mystico-metallurgical fantasy combines Vin's coming-of-age-in-magic and its well-worn theme of revolt against oppression with copious mutilations, a large-scale cast of thieves, cutthroats, conniving nobles and exotic mutants. The fast-paced action scenes temper Vin's interminable ballroom intrigues, while the characters, though not profoundly drawn, have a raw stereotypic appeal. (July)
Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.

From Booklist

The Sliver of Infinity, the Lord Ruler, is the locus of religious and temporal order in a world in which the skaa are slaves or worse. Half-skaa erstwhile thief Kelsior is the only person to survive and escape the Lord Ruler's most brutal prison, in which, however, he discovered he has the powers of the Mistborn, which are based on the internal "burning" of certain metals, all of which the Mistborn can use, while most others can burn only one. Now Kelsior plans his most daring raid ever, into the center of the palace to discover the secret of the Lord Ruler's power. Beforehand, his band finds the half-skaa orphan Vin in another thieving crew, where she's useful because she brings good luck. She is also Mistborn and, if she can master and learn to trust her powers, will enable Kelsior's crew to infiltrate the nobility and possibly overthrow the status quo. Intrigue, politics, and conspiracies mesh complexly in a world Sanderson realizes in satisfying depth and peoples with impressive characters. Regina Schroeder
Copyright © American Library Association. All rights reserved

Mistborn: Secret History is a companion story to the original Mistborn trilogy.

As such, it contains huge spoilers for the books Mistborn (The Final Empire), The Well of Ascension, and The Hero of Ages. It also contains very minor spoilers for the book The Bands of Mourning.

Mistborn: Secret History builds upon the characterization, events, and worldbuilding of the original trilogy. Reading it without that background will be a confusing process at best.

In short, this isn't the place to start your journey into Mistborn. (Though if you have read the trilogy--but it has been a while--you should be just fine, so long as you remember the characters and the general plot of the books.)

Saying anything more here risks revealing too much. Even knowledge of this story's existence is, in a way, a spoiler.

There's always another secret.

**