It is Valentine's Day, and the Camdens are celebrating the day of love with a special party in honor of the twins' first birthday. Eric and Annie fret over how to make it a memorable birthday, while the rest of the family learn different ways of exchanging love. After finally gaining her parents' trust, Mary is allowed to spend a romantic dinner with Robbie, only to learn he has ulterior motives. Meanwhile, Simon and Deena confess to their parents that they have given each other love bites. Also, Matt welcomes his ex-girlfriend Heather back into his life, threatening his relationship with Shana.

Eric finds himself on the hung jury of a case that he considers to be "open and shut," only to realize that he must help the other jurors regain their faith in the legal process in order to reach a fair verdict (a sort of Twelve Angry Men in reverse). Meanwhile, the other Camdens are suffering their own wrong doings as Annie and Ruthie ponder whether two wrongs make a right. Mary becomes indebted to Lucy after accidentally giving her ablack eye. Also, Simon and Deena realize that saying "sorry" can't turn back time, and Matt learns how important one person's voice can be.