Lydia Obukhova
Daughter of Night; a tale of three worlds
From the dust-jacket:

On earth, it is the dawn of history. Lilith, daughter of night, and the hunter Odam, who have been forbidden to marry, have run away to live together. One day, searching for honey, Lilith sees a strange man step out of an egg-shaped module that has dropped from the sky. Adventurous, and lured by the unknown, Lilith, overcomes her fear and superstition and befriends "the Nameless One," as she describes the stranger.

He is a member of an intergalactic space mission of scientists from the doomed planet of Layola-Lyal. They are searching for a hospitable planet able to support Laolitan life so that the planet's population can be moved to safety and its highly advanced society saved from extinction.

The Nameless One falls in love with Lilith, and human sentiment, dormant for generations in the mechanized society of Layola-lyal, is reawakened in him. But he knows that he must leave, and as a parting gift, he teaches Lihth how to make fire more easily, how to build a raft — the rudiments of civilization.

The ancient story of Adam, his first wife Lilith, and his second, Eve, is skillfully blended with legend and fantasy in this rich and compelling science fiction novel from the Soviet Union.

—Lydia Obukhova, Russian writer who began publishing work of interest as early as 1945, and whose books gained some popularity in her native land. Lilit (Daughter of the Night) tells the story of Adam's first wife, Lilith, who meets an alien assessing earth for colonization. He falls in love with her, presents her with the gift of fire, and saves the planet from his own people. (ESF-JC)