监狱电影中的代表作,改编自真人真事。桀骜不驯的青年劳勃斯.特劳德被判终身监禁,某日有一只生病的小鸟飞进他的牢房,在他细心呵护下竟然将小鸟医好了。他从此在狱中发奋研究,成为国际知名的鸟类学家。期间他要对抗过分保护他的母亲和粗暴的监狱长,也依旧不改其志,最后透过作家汤姆.加迪斯将他的传奇故事流传于世。导演约翰.弗兰肯海默以严谨手法诠释这个基本上相当静态的故事,虽然没有一般逃狱电影的紧张刺激动作,但气氛依旧紧凑动人。兰卡斯特充分掌握住主人翁的气质和感情,扮演狱友的特利.萨瓦莱斯亦十分抢戏。In 1912, the notorious and violent prisoner Robert Franklin Stroud is transferred to the Leavenworth Prison convicted for murdering a man. When a guard cancels the visit of his mother, Elizabeth Stroud, due to a violation of the internal rules, he stabs and kills the guard and goes to trial three times. He is sentenced to be executed by the gallows, but his mother appeals to President Woodrow Wilson who commutes his sentence to life imprisonment. However, the warden, Harvey Shoemaker, decides to keep Stroud in solitary for the rest of his life. One day, Stroud finds a sparrow that has fallen from the nest in the yard and he raises the bird until it is strong enough to fly. Stroud finds a motivation for his life raising and caring for birds and becomes an expert in birds. He marries Stella Johnson and together they run a business, providing medicine developed by Stroud. But a few years after, Stroud is transferred to Alcatraz and has to leave his birds behind.