Professor Langdon St. Ives brilliant but eccentric scientist & explorer is at home in Aylesford with his family. Not far away a steam launch is taken by pirates the crew murdered & a grave is possibly robbed of the skull. The suspected grave robber the infamous Dr. Ignacio Narbondo is an old nemesis of St. Ives. When Narbondo kidnaps his son Eddie St. Ives races into London in pursuit.