The fourth season of "Ghosts" premiered with a new episode, continuing the adventures of Alison and the gang of ghosts. Without specific details on S04E01, it's reasonable to assume that the episode likely introduces new challenges or misadventures for the characters, possibly exploring themes of friendship, growth, and, of course, the afterlife.
Fans of light horror-comedy, ensemble sitcoms, and anyone who wondered what happens when a Puritan ghost decides modern ghosts are "too soft."