The W Plan

Directed by Victor Saville

Written by Victor Saville, Miles Malleson, Frank Launder

Cast: Brian Aherne as Duncan Grant, Madeleine Carroll as Rosa Hartmann

Released 1930

Film version of the first book in the series. When word comes of a major activity by the Germans during WWI, Duncan Grant is picked to go behind enemy lines to learn the truth. He uncovers a scheme to tunnel into British territory to destroy them from behind and beneath.