A woman of no more than thirty years of age, she has fierce and striking features. Marjorie is the paid chaperone for Miss Kate de Vries. She is a stoic, inflexible woman who does not trust her charge. Simpkins likes attention, and often feigns headaches to ensure she is pampered and excused from any strenuous activities when she would prefer to be excluded. When Kate repeatedly defies her, going ashore and disappearing into the island woods on more than one occasion, she tries to confine her to their quarters but Kate is not that easily dissuaded. Kate uses her own sleeping draft against her, drugging her unconscious so that she can escape again. Eventually, Simpkins and Kate reach an understanding, and Kate gains a little freedom.
