Ellery Queen is said to be married and the father of a child in the introductions to the first few novels, but this plot line is never developed and Ellery is mainly portrayed as a bachelor. The character of Nikki Porter, who acts as Ellery's secretary and is something of a love interest, was encountered first in the radio series. Nikki's curiosity and her attempts to encourage Ellery to work as a detective are responsible for a number of radio and film plots from the early 1940s. Her first appearance in a written story is in the final pages of "There Was An Old Woman" (1943), when a character with whom Ellery has had some flirtatious moments announces spontaneously that she's changing her name to Nikki Porter and going to work as Ellery's secretary. Nikki Porter appears sporadically thereafter in novels and stories, linking the character from radio and movies into the written canon. The character of Paula Paris, an agoraphobic gossip columnist, is linked romantically with Ellery in one novel, "The Four of Hearts," and in short stories during the Hollywood period, but does not appear in the radio series or films, and soon vanished from the books. Ellery is not given any serious romantic interests after Nikki Porter and Paula Paris disappear from the books. Late in the series, in the 1968 novel "The House of Brass", Inspector Queen remarries after decades as a widower.