The death of Aunt Harriet demonstrates the brutality of the Waknukian religion. The guilt of having an imperfect child is so phenomenal that suicide is better to anyone discovering the truth. She doesn't want her child to grow up as an outcast in the Fringes, and she believes that death is the best option for both of them.
Horses play a crucial role throughout the novel, although their significance is not always consistent. They represent hope and a possible path to freedom in this context. Instead of being afraid of the unknown, the Wenders have been preparing for it. Mr. and Mrs. Wender's request for David to stay in their home reveals that, while Mr. Wender was originally suspicious of David, he now completely trusts him.
'When we've gone don't go home at once. Will you stay here till tomorrow morning?'(Wyndham 48)
'Goodbye, David, dear.' (Wyndham 49)
David’s dreams tend to appear in moments at which David should keep something to himself. He does, however, tell the others about what happened with Sophie. They cannot deny the authenticity of David’s thoughts, and are forced to question the ideas about mutations that they are taught in church and at school.
'I couldn't help it, Sophie,' I sobbed, 'I couldn't help it.' (Wyndham 52)