Serial killer Howard Epps returns, and he’s taking the Jeffersonian on a wild goose chase. Can Booth and Brennan uncover his trail of clues before another person dies? Carla and Emily muse on psychopathology and serial killers. How do two murderers link up, “Folie à Deux” style? Plus, lots of cold goss and even a message from “Bones” creator Hart Hanson!