Only on the "CBS This Morning" podcast, screenwriter Alex Michaelides talks with CBS News' Demarco Morgan about his debut novel, "The Silent Patient." Michaelides, who has written scripts for films starring Uma Thurman and Rosamund Pike, explains why screenwriting can be a "heartbreaking process" and why writing this novel was more gratifying. He also discusses how what he saw and experienced as a volunteer in a psychiatric unit made its way into his book, which explores how and if people recover from trauma. He shares how therapy helped him heal from his own childhood trauma, plus how our voices give us agency in seemingly powerless situations and the role Greek mythology played into the novel.