Possible Clues:

• Ambassador's aide
• Almost bound to be a diplomat
• This case taken up by diplomat
• A small rectangular case for documents
• The case of the painful non-drinker
• Connected to the French ambassador's assistant
• How to make us use embassy employee
• Might be the case of the pain of a non-drinker
• The case of the diplomat is enough to make a non-drinker sore
• Diplomat may open such a case