After a summer full of get-me-off-this-game-show-style reality crap, it’s nice to see good drama make a come back. Besides the fourth season return of Breaking Bad (tonight at 10 p.m. on AMC), a new short-order detective series from PBS begins tonight called Zen (part of Masterpiece Mystery!, 9 p.m., check PBS affiliates in your area). Rufus Sewell, so good