Sky Dragons: Dragonriders of Pern

Blurb

Sky Dragons is a science fiction novel by the American-Irish author Anne McCaffrey and her son Todd McCaffrey in the Dragonriders of Pern series that she initiated in 1967. Published by Del Rey Ballantine and released July 2012, Sky Dragons is the sequel to Dragon's Time.
This was the last collaboration between mother and son, which Anne described in a foreword to Dragon's Time as "helping Todd wrap up this very dramatic part of Pernese history."