In a continuation from the first book, "Time Slip: When Yesterday Ends", Dr. Mona Barrett has returned from her harrowing trip to the past, back to her wife, Dr. Stacey Ann Miller, and the normal world. But Mona has brought two survivors, who are acclimating to their new home as best they can.

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Suddenly, a new guest arrives from the distant past, throwing all of their lives into turmoil.

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Worse yet, this stranger has intimate knowldge of the TSD and creates his own device that threatens the existence of the entire world, and the entire human race.