Sandy tries to make up for keeping Rebecca's return a secret from Kirsten by showering her with Valentine's Day gifts. Zach, Summer and Seth head to San Diego to pitch their comic book idea, and Seth is determined to use the trip to get Summer back. Julie returns from her European vacation and has decided to reconnect with Marissa. Meanwhile, Ryan wants to spend Valentine's Day with Lindsay, but her loyalty to Caleb gets in the way.

It's raining in Newport. Marissa tells Julie that she and Alex are an item and decides she has to get out of Caleb's house. Summer is faced with a big decision as she prepares to go Italy with Zach. Ryan convinces Lindsay to take the paternity test and everyone anxiously awaits the results. Meanwhile, Sandy finds himself stranded in a motel room with nothing but a few snacks, champagne and Rebecca.