Hook up with what's coming down as the core-four romances of Ryan-and-Marissa and Seth-and-Summer may (or may not) go from very over, to very on; Sandy and Kirsten face choices that could trainwreck their 20-year marriage; felon, (and Ryan's brother) Trey gives Newport living a try; Julie's lurid past comes back to haunt her and other new hunks and hotties become part of the coastal scene.