Black Ivory was a 1945 Australian radio serial by Warren Berry about the slave trade for the George Edwards Company.
"The story of how Gerald Congraves blackmailed Peter Luke into being the skipper of one of CongraveâÂÂs slaving vessels. While on the voyage, a cyclone breaks out and LukeâÂÂs wife, Jean, is washed overboard. Luke believes that Congraves killed her and starts a fight on the small raft in which the two men escape after the ship sinks. They are picked up by a ship and return to London, where Congraves and Luke part."