Visiting the famous hunter and wildlife writer Mahitosh Sinha-Roy in his Jalpaiguri palace, Feluda is presented with a riddle that holds the clue to ancestral treasure. But before he can begin unravelling the puzzle, Mr Sinha-Roy's secretary is found dead in the forest, his body savaged by a big cat. Feluda's investigations lead him deeper and deeper into a scandalous family secret, and bring him face to face with a bloodthirsty royal Bengal tiger in a final confrontation.