A brutal force of insectoid aliens called Throgs effortlessly destroy a Terran survey camp on Warlock, a planet seemingly devoid of intelligent life that both Throgs and Terrans hope to colonize. Two Terrans who survive the enemy attack must go on the run, weaponless and with only a pair of wolverines as their companions. These survivors are driven to an unknown destination by dreams so powerful that they may be visions, but as they get closer to their goal, crossing brutal landscapes, tumultuous seas, and fog-filled caverns, the two find themselves losing control over their actions and unsure of what is real in this strange and hostile world.