A busload of ghosts travels from a grey, dismal city to the outskirts of Heaven, where they must decide whether to abandon their earthly attachments or remain in their self-imposed exile. The narrator observes these spirits as they encounter residents of the afterlife who urge them to relinquish their pride, bitterness, and illusions. The narrative framework is a dream vision, utilizing a first-person perspective to explore the psychological and spiritual barriers that prevent individuals from accepting grace. The physical world of the afterlife is depicted as hyper-real and solid, contrasting sharply with the insubstantial, shadowy nature of the visitors.

This work is widely regarded as a cornerstone of twentieth-century theological fiction, praised for its imaginative depth and psychological acuity. Readers often note the effectiveness of the 'solid' versus 'shadowy' metaphor in illustrating the weight of moral choices. The text is frequently analyzed for its ability to distill complex philosophical arguments into accessible, character-driven encounters. It remains a staple in discussions regarding the intersection of literature and Christian apologetics, consistently drawing interest for its nuanced portrayal of human stubbornness and the possibility of redemption.