Legion: Lies of the Beholder (2018)

Legion:  Lies of the Beholder is a 2018 science fiction novel written by Brandon Sanderson, as the third and final part of his Legion trilogy.

Background
Sanderson wrote the first story on the flight home from France in the summer of 2011. It "came from an idea I'd been kicking around in my head for a few months, and the time seemed right to explore it on paper. When finished, I sent it out to my agent - and we had a Hollywood option by the end of the year.

Plot
Stephen Leeds, or 'Legion', has his final adventure. Two unrelated events start it off: the disappearance of one of Stephen's many "aspects", Armando, and an unexpected cry for help from Sandra, the woman who helped him learn to live with his condition many years before. The combination of the two leads to a sinister high-tech firm specializing in advanced methods of human incarceration.

Reception
Legion has been well received by reviewers, one commenting: "This is the first time I wish a Brandon Sanderson story was longer than it ended up being. Maybe we'll get to read more about Stephen "Legion" Leeds in future stories or novels, if Sanderson finds the time between all his other projects. Leeds is definitely a character with enough depth to lead an entire novel, or even a series. Based on this short teaser novella and Sanderson's writing talent, Legion could be the starting point for a great contemporary fantasy/crime hybrid".

Television Rights
In 2013, Sanderson posted on his blog that Lionsgate has the rights for a Legion television show under option, and later said the TV rights were purchased by Lionsgate sometime in 2012. In 2016, Sanderson posted on Reddit that interest for making a series had dwindled after a show with the same name featuring a similar character from Marvel Comics' X-Men universe was announced.