Obsolete Theorem: Across Horizons: Book One

A time jump. A fight for survival. A bond between species.

It wasn't possible, but then it happened...

A Neanderthal's 47,000-year-old remains are found in Spain. That's not unusual, but positioned beside the woman's skeleton is something that shouldn't be there-a robotic drone. Lincoln Woodhouse has some explaining to do.

When confronted with the evidence, Lincoln cannot deny that the drone is one of his own models. After all, he routinely jumps his drones into the past to collect environment...