Vengeance is timeless. When a wicked repairman pushes Simon too far, he sues to have him branded forever as the monster he is. Meanwhile, millions of years in the past, an early canine hounds the pack of dinosaurs who murdered his family, determined to slaughter them in return. Separated by eons, man and dog-beast alike will stop at nothing to have their revenge, no matter the danger or cost. But when their parallel quests expose unexpected threats and opportunities, will they obey the siren song of retribution or veer from their warpaths in search of a new and very different revelation?