House of Secrets / House of Attitude / House of the Blackbird / House of Dares / House of Lies are the 1st, 2nd, 3rd, 4th, and 5th episodes of Season 1 and overall. They premiered on January 1, 2011. They also made the first hour long episode.
In the series opener of this mystery set at a British boarding school, new student Nina Martin arrives from America and learns that another student, Joy Mercer, disappeared earlier in the day. She also is told never to enter the locked attic, and she receives an old locket from an elderly woman, Sarah Frobisher-Smythe , on the school grounds.