Heir to the Fourth Reich

What if Adolf Hitler's death during April 1945 was not the end of the Hitler dynasty? 
What if the assassination attempt on der Führer's life during July 1944 resulted in a little-known injury and brings into being an heir who can transition the Third Reich into its next phase?
In this fast-paced dystopian thriller spanning Europe and South Africa during and after the Second World War, the concept of a Fourth Reich takes on a chilling reality in the historical reality that Hitler's body was never conclusively identified and DNA testing was still decades away from discovery.