We preview a touching and fascinating POV documentary tonight on PBS titled "In the Matter of Cha Jing Hee." In it, a Korean-American woman, Deann Borshay Liem, journeys back to South Korea to try and solve a mystery. When she was sent away to live with her adoptive parents in America (she was eight years old at the time) she was told to hide her real identity and name and pretend that her name was Cha Jung Hee. She goes back to find out why the identities of these two young girls were switched- and also (she hopes)to find the real Cha Jung Hee.