Sub-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.

Time travel is real, but Reality is on borrowed time.

“Let's just say,” the woman said, laughing, “that this old acquaintance of yours is going to be ... insurance.”
“I'm telling you,” Steven warned. “It’s a bad idea. He won't play along!”
“Oh, I'm well aware of that,” she replied. “As a matter of fact, I'm counting on it!”
The year is 2182, and someone is trying to kill Private Eye Joe Coyne. While Joe has his fair share of enemies, this one is different: a mysterious and powerful woman known only as Cassandra. Framed for murder, with every cop on the planet after him, Joe finds he has no choice but to track down this "Cassandra" if he ever hopes to clear his name. His only clue is a man by the name of Maxwell Sanders.