Mistborn is the first book in the Mistborn trilogy, and the second book by author Brandon Sanderson. In Mistborn, Sanderson introduces us to a whole new set of magical rules than the ones from his debut novel Elantris.
In a nutshell, the plot of Mistborn is simple. A street urchin with magical powers (known in the Mistborn trilogy as allomancy) is befriended by the resistance in hopes of her helping to overthrow a ruthless and immortal dictator who has governed and enslaved the peoples of the world for a thousand years, and, unless something is done, is likely to continue for many millennia more.