Possible Clues:

• What about mine? A quiet final tribute
• In memory of English detective - the one you associate with a pipe, in the main, and Hitchcock's central character?
• A grave message
• Message on a tombstone
• Inscription found by bed in messy heap?
• What may cover grave at heart of chapel?
• Commemoration: what about inscribing it in gibberish?
• Inverted hearts and crown containing letter's last words
• Inscription from mine covered in messy heap
• Remarks on stone heap moved around mine