The book review summarizes the book "Unposted Letter" by T.T. Rangarajan. It is a general reading book containing short stories about everyday life meant to provide inspiration and encourage personal growth. Each chapter is only 2-3 pages and uses simple language and examples from daily life to impart life lessons and influence readers. The book aims to help readers understand their subconscious minds better to face truths and improve how they deal with struggles. It teaches finding happiness in small things to lead a happier life. The reviewer recommends the book for transforming readers' character.