In 2004, an officer for a security agency that regulates time travel must fend for his life against a shady politician who has a tie to his past.    …

In order to protect the reputation of the American space program, a team of NASA administrators turn the first Mars mission into a phony Mars landing. Under threat of harm…

When a hunter sent back to the prehistoric era runs off the path he must not leave, he causes a chain reaction that alters history in disastrous ways.    …