A new life for Ryan Atwood, the Cohens and the Cooper families, and basically everyone else in the wealthy, picturesque, secretive, turbulent community of Orange County.

Be prepared to meet spoiled rich kids and watch Ryan struggle to fit in with his new crowd...

Sandy comes to Ryan's rescue once again, after he has a difficult stay in Juvenile Hall. Seth makes Kirsten aware of his anger over Ryan's situation, and Kirsten makes a compromise. Ryan's mother, Dawn, makes a surprise visit to Newport, and things don't go quite as she and Ryan may have planned. The monetary secret involving Julie, Jimmy, Kirsten and Sandy comes to a head.

Ryan thinks about not inviting Marissa to his 18th birthday after their falling out but Sandy tries to get him to invite a relative. After months of avoiding telling Summer and Marissa the truth Neil and Julie tell Summer and Marissa the truth.

Ryan decides to go and invite his mother to his graduation party. Taylor and Summer work together to try and find out what Seth is hiding, but Summer ends up getting hurt. Marissa realises she is in bad company after she finds out how low Volchok's friends can go. Sandy is able to fix his work problems with Matt but while doing so he hurts Kirsten.

It is graduation day for Ryan, Seth, Summer, and Marissa at Harbor High School. After graduation they all went out to eat and celebrate their graduation. Ryan's mother gave him a new car as a graduation present. Marissa is going to spend a year on a boat with her father as her graduation gift. Seth finally got into RISD for second semester. Summer is still going to Brown University in the fall. Volchok is still mad at Marissa and Ryan so he decided to crash Ryan's car.