Sybil and Blake Gregory have established a predictable, well-ordered Manhattan life, but everything changes when Blake is offered a dream job in San Francisco. He accepts it without consulting his wife and buys a historic Pacific Heights mansion as their new home. The past and present suddenly collide for them in the elegant mansion when an earthquake shocks them the night they arrive. The original inhabitants appear for a few brief minutes. In the ensuing days, the Gregorys meet the large and lively family who lived there a century ago. All long since dead. All very much alive in spirit, and visible to the Gregorys… and to no-one else.