Humanity is counting on Grace to let her son die. It’s the end of the 21st century, and Grace's son, Jordan, has contracted a fatal soul-stealing disease, Metagenesis. Desperate to save him, Grace volunteers for an unapproved trial involving time travel. Leaving Jordan with her estranged husband, Grace and her best friend, Kay, embark on a journey to Las Vegas, circa 2000, racing against time in search of the cure. But the hunt proves to be more than they bargained for. Mysterious assassins lurk around every corner, and someone is sabotaging their mission, leading Grace to a gruesome discovery. The sinister truth behind the trial forces Grace to make a painful decision—with her son’s life hanging in the balance. If she saves him, she triggers widespread Metagenesis, sealing the fate of the human race with a new plague. Her other choice is to let Jordan die.

Grace knew killing her soulmate to save her son Jordan’s life would trigger a new plague. She did it anyway. When a plan to stop the man responsible came together, Grace jumped at the chance for redemption, bringing Marc, Charlie, and Kay along to 1930s Germany. However, the plan derails fast when a betrayal lands the group in 2006 Las Vegas instead, leaving them stranded. Refusing to accept defeat, they seek help from others in 2006—namely, Jordan. But he seems to have his own agenda and is reluctant to help. Meanwhile, Marc is unwilling to forgive Grace’s selfish decision and turns cold toward her. As the ice thickens between them, and Jordan’s agenda begins to unfold, Grace is fraught with regret. If she had known who her son would become, would she still have saved his life?