John Cho stars as a widower father whose life gets turned upside down when his teenage daughter goes missing.  As he goes online to search for clues to her whereabouts, he discovers that the close relationship he thought he had with her may not have been as tight-knit as he was led to believe.  Debra Messing co-stars as the missing-persons detective on the beat in this nifty thriller that sets all of its actions on the screens of a variety of computer devices.