After the tragedy of the Titanic, Ben Laevery travels through time and appears in the middle of a city he does not know. He loses consciousness again.
When he opens his eyes he becomes aware of a woman who is tending the wound on his head. He has never seen him before, but she reminds him very strongly of someone he has known in the past. He feels an increasing attraction towards her—Maggie—and his feelings are reciprocated.
Ben is overwhelmed with questions, but he can remember nothing about his past. What has brought him here? Is it possible to live another life in a parallel universe? But, above all,will he be able to remain by Maggie's side, or will he be reabsorbed by that strange force some day, and returned to the time and place he came from?