Dad In Training by Cynthia Thomason

The man least likely to be a father…finds out he has a son!

Living in a remote cabin with his dog suits rafting guide Jace Cahill fine. Until an orphaned boy and his guardian show up in Holly River. Kayla McAllister tells Jace he has thirteen days to prove himself as a father. And when he falls for the pretty, ambitious DC assistant, Jace must prove he's exactly what she and his son need.