Star Wars: Lords of the Sith is a Star Wars novel by Paul S. Kemp, published in April 2015. Set between the film Revenge of the Sith and the novel Star Wars: Tarkin, as well as the TV show Star Wars Rebels, it features Darth Vader and Emperor Palpatine facing off against revolutionaries, led by Rebel Alliance Partisan Cham Syndulla. Lords of the Sith was one of the first four novels published in the franchise after Lucasfilm redefined Star Wars continuity in April 2014. Source: Wikipedia (en)