“Echo” begins with a heart-racing scene as Golden Earring’s “When the Bullet Hits the Bone” plays in the background. Emotions run high in this season finale as Philip (Matthew Rhys) and Elizabeth (Keri Russell) deal with Paige (Holly Taylor); Stan (Noah Emmerich) decides what to do about Nina (Annet Mahendru); and finally, the Connors’ murderer is revealed. If you’ve read my review of “Operation Chronicle,” I totally saw that coming!