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The Lepidopterist's Companion
Mobile librarian Margaret Cartwright's photographer husband Graham attacks and kills an intruder, who turns out to be his young assistant Lewis Ward. Lewis was apparently taking pornographic pictures of young women and furthermore he had been poisoned and his body dumped at the Cartwrights before Graham hit him. Father Brown discovers that the illicit photos were being distributed through the library's most popular lend, The Lepidopterist's Companion, leading to the unmasking of the actual photographer as Lewis's killer.