Jason Maxim

Eager to help Ryan and Trey repair their relationship, Marissa hosts a birthday party for Trey at Caleb's mansion that quickly gets out of control. Meanwhile, Summer finds out exactly what Seth's publisher's really like.

Although they are finally happy with each other, Marissa and Ryan are forced to stay apart by their parents. Elsewhere, Dean Hess pressures Seth and Summer into showing their Harbour School spirit, which leads them to devise a covert plan.

After Sadie and Ryan go on a road trip, it could signal the end of Ryan and Marissa's relationship.

Ashley's world begins to fall apart after spending the night with Spencer.