In 1942,on the brink of a Japanese invasion, two Australian soldiers were dispatched to the Myall Lakes to establish a secret arms and gold bullion cache, but were killed by a Japanese submarine on there way back to base. The location was lost for ever. In 2008 a criminal accidently found the cache. He decided to use an old wartime submarine to steal the gold. Captain Marcel Beaumont on holiday, saw a human hand in a black swans beak. He joins local police to track down the killers and discovers the gang who murdered the girl. Sophie has followed a London solicitor who is in charge of the gang and the bosss man tries to escape in a submarine with the gold. In the course of events, Sophie falls in love with Marcel.