According to DreadCentral:
"Locke & Key" revolves around Nina (Miranda Otto) and her three children, Tyler (Jesse McCartney), Kinsey (Sarah Bolger), and Bode (Skylar Gaertner), who survive an unspeakable horror and attempt to rebuild their lives at Keyhouse, their family home in Lovecraft, Massachusetts. It is a mysterious New England mansion with fantastic and transformative keys hidden inside its walls that are also being sought by a hate-filled and relentless creature with ties to the Locke family's past who will stop at nothing to accomplish his sinister goals.(From USAToday)
Josh Friedman ("Terminator: The Sarah Connor Chronicles") wrote the pilot, which Mark Romanek is directing.