Jesse McCartney (Greek) has signed on to play what is effectively the male lead in the Fox drama pilot Locke & Key, based on the comic book by Joe Hill.  According to Deadline, McCartney will play Ty, one of the three children of Nina Locke (Miranda Otto) -- Sarah Bolger and Skylar Gaertner play the other two.The story begins shortly after the murder of husband and father Rendell Locke.  The family return to Keyhouse, Rendell's old family home in Massachusetts, where they are haunted by an evil entity.  Ty retreats into his music as a way to cope with the death of his father, which ought to show off McCartney's particular skill set as an actor/songwriter.  I was charmed by McCartney in his guest arc on Greek, so I'm happy to see him at the center of a series I have high hopes for.Steven Spielberg, Josh Friedman (Terminator: The Sarah Connor Chronicles), and partners Roberto Orci and Alex Kurtzman (Fringe) are producing.  Mark Romanek (Never Let Me Go) will direct the pilot.