Final answer:
Grace Poole is a character in Charlotte Brontë's 'Jane Eyre', employed at Thornfield as a seamstress and the secret caretaker of Bertha Mason.
Step-by-step explanation:
In Charlotte Brontë's novel Jane Eyre, Grace Poole is employed at Thornfield Hall as a seamstress but is also there to attend to a secret duty that is initially unknown to Jane and the other inhabitants of Thornfield. Her primary role is revealed later as the caretaker of Bertha Mason, Mr. Rochester's mentally ill wife, who is kept hidden in the attic. The character of Grace Poole is enigmatic and serves to add suspense to the gothic elements of the story.