Two new murder mystery novels let readers into hidden worlds: one underground and the other among the wives of serial killers. First, Ruby Falls begins in 1928 in Chattanooga, Tennessee when a man discovers a mysterious underground cavern and waterfall. In today’s episode, NPR’s Scott Simon speaks with Gin Phillips about the publicity stunt that sets her story in motion. Then, Lizzie Pook chats with NPR’s Ayesha Rascoe about The Secret Lives of Murderers’ Wives – published under the pen name Elizabeth Arnott – in which three women find each other after their husbands’ crimes are uncovered.To listen to Book of the Day sponsor-free and support NPR's book coverage, sign up for Book of the Day+ at plus.npr.org/bookofthedayTo manage podcast ad preferences, review the links below:See pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

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“What did the council decide on item 42?” — answered with the speaker and the moment.