What's so perfect about the past for Sybil and Blake Gregory, a successful Manhattan couple with three children who land in San Francisco when Blake impulsively accepts the job of a lifetime as CEO of a start-up? The family moves into a grand, surprisingly affordable Pacific Heights mansion and soon meets the affable Butterfield family, who lived there a century ago. Of course the Butterfields are ghosts, and only the Gregorys can see them, but that doesn't keep the two families from leading a charmed life together.