Dev Khanna has it all before a mysterious letter shakes the very foundation he has built his life on. With his beliefs challenged, he decides to close the chapter once and for all. I Owed You One is the story of promises and commitments, of triumphs and defeat, and of hoDev Khanna has it all before a mysterious letter shakes the very foundation he has built his life on. With his beliefs challenged, he decides to close the chapter once and for all. I Owed You One is the story of promises and commitments, of triumphs and defeat, and of holding on and letting go.lding on and letting go.