Ryan travels to Albuquerque to invite his mother, Dawn, to his graduation. He meets beautiful, Chloe, who happen to be a colleague and friend of Dawn's. Summer calls off the break up with Seth to find out what his problem is. After Seth breaks it off with Summer, Summer and Taylor team up to find out if Seth still loves Sum. After he declines his love, Summer is heartbroken. Meanwhile, Marissa is dealing with her controlling mother's influence on her as she hangs with Volchok and helps Heather. Also, Sandy is still trying to rescue Matt from Griffin's huge mess. It may cost Sandy his marriage, but if he doesn't do anything...it will cost Matt's life.