From the outside, the Chengs seem like so-called model immigrants. Once Patty landed a tech job near Dallas, she and Liang grew secure enough to have a second child, and to send for their first from his grandparents back in China. Isnt this what they sacrificed so much for? But then little Annabel begins to sleepwalk at night, putting into motion a string of misunderstandings that not only threaten to set their community against them but force to the surface the secrets that have made them fear one another.