Claim: Ruth Cavin worked as an associate publisher of Thomas Dunne Books, a division of Macmillan Publishers, and specialized in mystery fiction.
Evidence: Ruth Cavin (October 15, 1918 – January 9, 2011) was an American book editor who worked as an associate publisher of Thomas Dunne Books, where she started working at age 70 and oversaw the publication of 900 books. Mystery fiction was her specialty in her two decades in the business. St. Martin's Press (Macmillan Publishers)