Book excerpt: A Disturbed Grave In A Century-Old Cemetery. A Ciphered Message. A Mysterious `Repeater'&Hellip; On A Visit To The Park Street Cemetery In Calcutta, Feluda And His Friends Chance Upon An Old Grave That Has Been Dug Into. Slight Clues Lead Them Into The Heart Of A Mystery That Is Both Complex And Blood-Curdling. When The Jigsaw That Involves A Seance In A Gloomy Old Building, A Singer In A Restaurant, A Ruthless And Rich Collector And A Midnight Vigil At The Graveyard Is Put Together, What Emerges Is One Of The Most Intriguing Mysteries Feluda Has Ever Been Faced With. &Nbsp;