Besides the fact that their kids all attend the same fashionable Brooklyn Heights private school, Bess, Robin, Carla, and Alicia have little in common. Thrown together on the tony school’s Diversity Committee, the women impulsively turn their awkward first meeting into a boisterous game of poker. Instead of betting with chips or pocket change, however, they play for intimate secrets about their lives.   As the Diversity Commitee meetings become a highly anticipated monthly ritual, the new friends reveal more with each game. Picture-perfect housewife Bess struggles to relate to her surly teenage daughter and judgmental mother. Robin, a single mom, grapples with the truth concerning her child’s real father. Carla, an ambitious doctor, attempts to balance the colossal demands of her family with her dream of owning her own private practice. And to distract herself from her troubled marriage, shy copywriter Alicia fantasizes about an attractive younger colleague.   Putting all their cards on the table, the four women grow to rely on one another, bracing for one final showdown.