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Hopalong Cassidy #77
Hopalong Cassidy intervenes to save a man named Jim from being lynched by a mob, only to learn that Jim is innocent and that a "fatal formula" is at the heart of the conflict. When Hopalong takes Jim to safety at a ranch, a circus train derails nearby, releasing two lions that escape into the hills. A villain plans to retrieve a formula hidden in the collar of one of the lions, forcing Hopalong into a desperate race against time to stop the criminals and save lives.