In a Word: A marriage, a cardiac condition, and other affairs of the heart bring everyone back to Tree Hill and pit them against each other again.

The Action: When Keith and Lucas learn about Dan's heart attack, they return to Tree Hill. Dan tells Lucas his health problems stem from a genetic defect, which Lucas also has. So, the abandoned son, denied every opportunity and advantage, gets the gnarly cardio-myopo-thingy. Great! The return's good for Keith, though. He meets Jules, and they fall in love. They even almost get married -- but it turns out that Dan paid her to be with Keith, to keep him out of the way.

No one's happy about Nathan and Haley's marriage. Not even, it seems, Haley. Fellow musician Chris convinces her to go on tour with him, and she leaves. But not before her older sister Taylor visits and reveals that she and Nathan once slept together. The marriage may be driving some people apart, but it's bringing others together: Dan and Deb are both against it, and they reconcile over that fact. It's true -- there's nothing like hate to rekindle love.

Nathan deals with Haley's departure by trying to kill himself in a car crash. He survives, but he's not the one who gets addicted to painkillers: It's Deb. While she's in rehab, Dan tells Nathan it's all his fault. Deb wants to take Nathan and get away, but Dan blackmails her and convinces Nathan to join him in disowning Lucas, who exposed Dan's shady business dealings.

Lucas, besides dealing with his actual broken heart, finally tells Brooke he's into her. But she leaves for the summer without saying anything. Luckily, Peyton's still around, so something's bound to happen with that. At the end of the season, Haley comes back, choosing Nathan over a life on the road. And a mystery person drugs Dan and sets his car dealership on fire. Any guesses who did it? The list of people with serious grudges is endless.

Our Take: Lucas really gets a raw deal this season, and not even the juiciest storylines. Let's see more action for him in the future!

Your Take: Who poisoned Dan? Were they justified?