A determined young woman is determined to clear her brother's name after he is accused of murder. He apparently killed his employer by pushing him into a penguin pool at the city zoo. She investigates the crime herself, uncovering a web of deceit and hidden motives. The investigation leads her to suspect that the victim's business partners might be involved. She must race against time to find the real killer before her brother is convicted.

The Penguin Pool Murder is a moderately engaging early detective film that benefits from a fast pace and a somewhat unusual setting. While the plot has some predictable elements, it delivers enough twists to keep audiences interested. Performances are generally solid for the era, and the film succeeds as a light mystery diversion.

• A serviceable early mystery with an interesting premise.
• The plot offers some intriguing twists and turns.
• Performances are adequate for a film of this period.

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The film is notable for its use of the then-novel setting of a zoo, particularly the penguin pool, as a central element of the murder mystery.