Three couples married as strangers four weeks ago. It's Fourth of July and the celebrations go off with a bang. Vanessa feels threatened by Tres' friendship with another woman; Samantha starts to understand Neil better after spending time with his friends; Ashley confronts David after she discovers he texted another woman.

The experiment is almost over for the couples who married as strangers. Tres and Vanessa's romantic trip away takes an unexpected turn and is cut short. Time apart makes Samantha realize how much she misses Neil. David works hard to regain Ashley's trust and save his marriage after she discovered he texted another woman.