When Kathy’s family is threatened, she discovers that her husband has kept a chilling secret from her for years: Her teenage daughter is not really her own flesh and blood, and the past is now coming back to haunt them all in a deadly way.

Alicia Crosby is a hugely successful children's fashion designer based in Los Angeles. Her personal life is equally successful as Alicia suspects her boyfriend Will Randall is going to pop the question any day now. But first, Alicia must survive meeting Will's family, which means getting down and dirty in their family's annual 'Reunion Races' where she is up against everyone from Will's mom, Barb, his dad, Doug, his seemingly sweet Grandma Dorie, to even Will's ex-girlfriend, Kris.