Possible Clues:

• Vacuum container
• Sylvia Plath novel (with "The")
• Protective glass cover
• Protective display cover
• Glass lab vessel covering gas etc
• Plath title item
• Sylvia Plath novel, with 'The'
• Sylvia Plath work, with 'The'
• Sylvia Plath's only novel, with "The"
• Glass vessel used to create a vacuum