Divergence: PORT101 - Book Two. The P.O.R.T. 101 Trilogy, #2

After witnessing the total destruction of life on Earth, Sonya is returned to her own time, with her memories of the future intact. With knowledge of her impending death, Sonya takes steps to unmake the future and to rewrite the events that would ultimately lead to her death and plant the seeds for the demise of human existence (3rd Edition).