 The "Hurst Castle" is abandoned but does not founder in a gale and the crew, unable to get to him, are forced to leave Stetworth marooned aboard.The ship drifts into the center of the Sargasso Sea where Stetworth finds himself in a ships' graveyard in which survivors of previous shipwrecks still inhabit the forgotten ships.Stetworth must rely on his own ingenuity to get free from the choking sargasso weeds.