Possible Clues:

• 'The Lady of the Camellias' author, 1848
• 'The Black Tulip' novelist, 1850
• Starts to deliver unusually brief service for dead author
• Musketeers writer
• Author of 'The Three Musketeers'
• 'The Black Tulip' novelist
• Milady de Winter's creator
• Writer unhappy about letter from abroad turning up
• Alexandre --, author of 'The Count of Monte Cristo' and 'The Three Musketeers'
• Creator of D'Artagnan