Book of the Day: The Martian Child : a novel about a single father adopting a son by David Gerrold

A recently widowed science fiction writer forms an unlikely family with a close friend and a young boy he adopts who claims to be from Mars. The new couple ignores some sage parenting advice from the widower’s sister and gets more than they bargained for when a series of strange occurrences leads them to believe that the child’s claim may be true.
Did you know so many movies were books first!?