 In the Pern collaboration with Todd, she was mainly "making suggestions or being a sounding board".McCaffrey also gave Todd and his sister Gigi permission to write their own stories set in the Pern universe.McCaffrey also collaborated with author Mercedes Lackey to write "The Ship Who Searched", the third of seven books in The Ship Who Sang series by McCaffrey and four other authors, and the only one by Lackey.