2/4 As Professor Dunning and Harry Crow search on, a dead music hall star makes a return.
BBC Radio 4 Extra
An unknown agent is ensnared in a sinister plot to brainwash scientists and trade them.
3/4 Professor Dunning is searching for Lionheart with Harry Crow, but a terrible truth awaits.
4/4 Lionheart's daughter is in the clutches of Montague Blake. Can Dunning and Crow save her?