"Spear and Fang" is a tale set in the prehistoric era, highlighting the raw essence of human and animalistic natures entwined with themes of love, bravery, and survival against the backdrop of a world filled with danger and the unknown. The story unfolds with A-aea, a young woman of the Cro-Magnon race, who is captivated not only by the artistic endeavor of Ga-nor but also by the man himself as he sketches a mammoth on the cave wall. Their world is one where the burgeoning of art, the complexities of social customs, and the elemental struggle for existence coalesce.

The narrative quickly takes a darker turn with the introduction of the Neandertal man or gur-na, a creature of a bygone age, representing the primal fear lurking in the depths of the forest, a remnant of a time when these beast-men dominated the landscape. The Cro-Magnon people, despite their advancements, live in a constant state of vigilance against these remnants of their evolutionary past.

As A-aea's curiosity leads her closer to Ga-nor, she inadvertently becomes embroiled in a life-threatening situation when Ka-nanu, a brash and imposing suitor, attempts to take her by force, only for both to encounter the terrifying reality of the gur-na. Ka-nanu, despite his initial intentions, shows a momentary courage before being brutally killed by the Neandertal man, who then captures A-aea.

Ga-nor, driven by a newfound purpose beyond his art, follows their trail, showcasing the evolution of human emotion and the concept of individual heroism. His battle with the Neandertal man is not just a fight for A-aea's life but a symbolic clash between two eras of human existence. Ga-nor's victory is a testament to the Cro-Magnon's superiority not just in strength but in intelligence and adaptability.

The story concludes with Ga-nor and A-aea's union, a poignant end that reinforces the narrative's underlying themes of love, evolution, and the triumph of the human spirit.