On this Christmas episode of Ghost Hunters, TAPS returns to Hartford, Connecticut to investigate the Mark Twain House. With their previous investigation marred by malfunctioning equipment, TAPS is being called back to look into new and frightening claims that could finally uncover who is residing there. Will Samuel Clemens' favorite holiday initiate an appearance from the famous author? Or will his three children try to reach out to TAPS? And later, Jason, Steve, and Tango meet the youngest TAPS member, Amy’s baby girl.