Whitney and Mariel's feud drives Whitney further into the wives' social circle. Amber questions her future in North Carolina. After surprising a childless couple with grant money for IVF, Samantha gets more serious about having another baby.

The ladies travel to Daytona for one of the biggest and most dangerous races of the season. Sam worries what her health issues might mean for having another child. As the race season nears the end, the clock is ticking for Amber to lock in sponsors.