"Sonata" is the season and series finale of the American paranormal romance television drama Moonlight, which first aired on CBS on May 16, 2008 in the United States. It was written by Ethan Erwin and Kira Snyder, and directed by Fred Toye. The series revolves around Mick St. John (Alex O'Loughlin), a private investigator who has been a vampire for over fifty years.