Hughes is known for the meticulous research which precedes the writing of each of her novels. As a result, the settings and situations are believable extensions of those which now exist on Earth. The plot holds the reader's interest, using suspense rather than graphic violence. Hughes's major characters are entirely credible. For example, despite his many admirable qualities, Jody possesses his share of flaws. He is observant and smart, but he knows how clever he is and he wants others to know it too. He is practical, but he feels scorn toward those who acquiesce more readily and learn more slowly.

He is brave and self-reliant, but he is also frightened by the dangerous mission he must undertake. This makes Jody a believably human character with whom readers can identify.

Because the novel is Jody's story, told from Jody's point of view, Olwen and Guardian are...