The Summer sisters don't have much in common other than shared DNA. But when their father's untimely death reveals an earth-shattering secret, everything they thought they knew about their family -- and their future -- changes overnight.Jen spent her childhood feeling like the ugly duckling, while Lynn longed to be appreciated for something other than her looks. Consequently, both sisters competed for their father's affections but were never satisfied. Jen still hasn't forgiven Lynn for fleeing to California to follow her dreams, leaving Jen to tend to their father and the family insurance business in Chicago's North Shore suburbs. Meanwhile, Lynn is living in exile in Los Angeles, forced to endure the pain of her humiliating divorce in silence because she is too ashamed to reveal her mistakes to her perfect older sister.As the youngest member of the trio, Courtney's life is also turned upside down due to her father's death, only for an entirely different reason; Courtney didn't even know he existed until after he was gone. Now she has to figure out what life looks like with two older sisters who can't stand each other while attempting to piece together her fractured youth.Although this tragedy should bring the sisters together, the depth of their father's betrayal coupled with their tumultuous past makes reconciliation nearly impossible. Only time will tell if the bonds of sisterhood are strong enough to mend past transgressions or if the sisters, and their secrets, will destroy the Summer family forever.