Danny's always been kind of an intense guy, but he ratchets it up to a whole new level tonight when an undercover detective (who's also a Reagan family friend) is killed in the line of duty. A grieving Danny becomes determined to track down the killer, leading Linda and the boys to worry about his mental state.

We get to return to our favorite 'Portlandia' locale tonight when the feminist bookstore celebrates its tenth anniversary -- and receives a surprise visit from guest star Penny Marshall. We're still wondering how a bookstore that openly avoids selling anyone any books can stay in business for ten years, but that's neither here nor there.

'Sons of Anarchy' star Maggie Siff guest stars tonight as Michael's high school sweetheart, who comes to his hospital with an irreversible neurological condition. Will Michael be able to set his feelings aside while he treats her? Yeah, probably not. Plus, Zeke is devastated to learn that his best friend's cancer has returned.

Season Finale: Time's running out for the miners as gold season draws to a close on tonight's season finale. The Hoffmans are still dead-set on their goal of retrieving 100 ounces, but they stumble when Todd tries to run the dozer on solid ice. Plus, the Big Nugget mine might have to close if Parker doesn't hit a pay streak.