In-Version

The Version Sequence is a multi-volume science-fiction action/adventure series featuring terrorists, time travel, and mind-bending plot twists. When two time-travelers discover that their pasts have been erased, each embarks on a mission of restoration. In the resulting clash, civilizations will be destroyed, billions will die, and one innocent teenager will suffer unimaginable loss to become mankind's last hope for survival.

“I always wanted to be the brave hero who saves the world,” Nancy said.
“Be careful what you wish for,” the man replied.
Past and future collide in this explosive series finale, and the stakes couldn’t be higher. In 1972 Nancy and her husband discover that an old enemy is behind terrorist attacks around the world, an enemy that must be stopped before everything the two have sacrificed so much to accomplish is destroyed. But this time, in order to save the world, the ultimate sacrifice may be required.

Reality is still on borrowed time, but time is running out!