Kate Trench was the wife of Zachariah Trench. Her Husband Zachariah accidentally "took work home," which resulted in her daughter Susanna falling ill. Trench, realizing his mistake, wished to bring Susanna to the Oldest House to help her. However, Kate refused to allow Susanna to be cared for by the FBC, and she was instead brought to civilian doctors, who were unable to help due to the paranatural nature of Susanna's illness. She subsequently died, and Kate subsequently divorced Trench.