In the novel Death in the Clouds, Gladys is a friend of Jane Grey. She works at M. Antoine's hairdressing establishment, alongside Jane. Jane carried a letter from Gladys onboard Prometheus.
Gladys is described as an "ethereal blonde with a haughty demeanour and a faint, faraway professional voice". In private, she has a hoarse, jocular voice.
When Jane asks M. Antoine for a raise, Gladys encourages her. She says that Jane has grit, and she admires her for that.