Their doorstep baby

Husband and wife Claire and Adam Townsend have been longing to have a child together, but with no success. Then one day, out of the blue, a newborn baby boy is left on the doorstep of their isolated Outback home! Claire is overjoyed by this unexpected arrival. But Adam is concerned about the mystery surrounding the baby's origins and insists they find out who the real parents are, before they adopt this little boy as their own. Having a baby changes everything -- will it change their marriage?