Thomas E. Lightburn
It is January 1939, eight months before the start of WW2. German residents, Gunter Schmied, his wife, Adelheid, and his son, Heinrich, are sent to live in London as German spies in order to collect information that will be of assistance to the Third Reich. Heinrich is ordered to join the Royal Navy as a wireless operator, where he will be privy to classified information regarding the ship's movements.
He climbs on board Endeavour, and, together with the rest of the ship's company, battles storms, wild seas and icebergs, as well as the fear of being discovered for who he really is.