What should a woman do if she believes she is the mother of the second coming of Christ? This is the problem Lara Joyner faces when she comes to believe, through her visions, through the look on his face, through her cards, and through the thousands of hidden signs she sees in nature, that her son is Christ incarnate.
Incarnate is driven by this woman's character and readers struggle between wanting to sympathize and knowing she is deeply troubled. In the end, we discover how her delusion turns many worlds upside down, as well as how faith overpowers reason. The story follows Lara and her two sons as she pushes Dale to perform miracles and save humanity. Although obviously unable to do so, he goes through the motions to protect his little brother Louis. Told alternately from Lara's perspective (in the present tense) and from the other principles in the story, the plot follows the trials brought on by Lara's spiraling madness, her husband's desperate search for his family, and the children's bewilderment and fear.