The Sign of the Twisted Candles is the ninth volume in the Nancy Drew Mystery Stories series. As the second volume written by Walter Karig, it was originally published in 1933 under the pseudonym Carolyn Keene. Due to Karig having died in 1956, as of January 1, 2007, the 1933 book and the other two Nancy Drew books he wrote, have passed into the public domain in Canada and other countries with a life-plus-50 policy. Source: Wikipedia (en)