Young Mona idolizes her father, a brilliant mathematician. When he suddenly demonstrates signs of mental illness, Mona begins to obsess about numbers, using them to interpret an unpredictable and threatening world. Now an adult (Jessica Alba), Mona's old superstitions and compulsive behaviors continue to flourish, but a new job as an elementary school math teacher (a position she both relishes and dreads), may force her out of her protective shell. With imagination and humor, as well as a special sensitivity to the realities of mental illness, AN INVISIBLE SIGN carries a magic all its own.

Eleven-year-old New York City public school kids journey into the world of ballroom dancing and reveal pieces of themselves and their world along the way. Told from their candid, sometimes hilarious perspectives, these kids are transformed, from reluctant participants to determined competitors, from typical urban kids to "ladies and gentlemen," on their way to try to compete in the final citywide competition. Providing unique insight into the incredible cultural diversity that is New York City, this film profiles several kids from three schools (out of 60) at this dynamic age, when becoming that "cool" teenager vies for position with familiar innocence, while they learn the merengue, rumba, tango, the foxtrot and swing.