Jessica Alba stars in the bland, lighthearted indie comedy An Invisible Sign. The story follows a socially dysfunctional young woman who takes a job as an elementary school teacher, but has trouble connecting with her students. The film lives and dies on Alba’s performance, and unfortunately she’s not very good. It’s hard to get a handle on her character, and whether she has a mental disorder or is just incredibly socially awkward. And there are a number of issues with the plot. Yet, An Invisible Sign is mildly entertaining and has some charming moments.