Sybil and Blake Gregory have established a predictable, well-ordered Manhattan life, but everything changes when Blake is offered a dream job he can't resist as CEO of a start-up in San Francisco. He accepts it without consulting his wife and buys a historic Pacific Heights mansion as their new home. Shockingly, in an earthquake the night they arrive, the original inhabitants appear for a few brief minutes. All long since dead. All very much alive in spirit, and visible to the Gregorys and to no-one else.