Hawke had two films premiered at the 2015 TIFF, both garnering favorable reviews. In Robert Budreau's drama film "Born to Be Blue", he played the role of jazz musician Chet Baker. The film is set in the late 1960s and focuses on the musician's turbulent career comeback plagued by heroin addiction. His portrayal of Baker was well received; "Rolling Stone" noted that "Everything that makes Ethan Hawke an extraordinary actor — his energy, his empathy, his fearless, vanity-free eagerness to explore the deeper recesses of a character — is on view in "Born to Be Blue"." In Rebecca Miller's romantic comedy "Maggie's Plan", Hawke starred as an anthropologist and aspiring novelist alongside Greta Gerwig and Julianne Moore. His other films that year included the coming-of-age drama "Ten Thousand Saints" and the psychological thriller "Regression" opposite Emma Watson. In November 2015, Hawke published his third novel, "Rules for a Knight", in the form of a letter from a father to his four children about the moral values in life.