Based on true historical events, Madeline Martin’s novel “The Keeper of Hidden Books” is a story of how brave citizens formed underground libraries and book clubs in Warsaw as a way to preserve culture in the face of Nazi book bans and censorship. Martin tells the story through the lens of a fiery young woman named Zofia who is determined to protect her friends, her family, and the written word, against all odds. Martin talks about how she researches her books, why she’s interested in World War II and what it’s like to be a full-time writer while raising teenagers.