Bulldog Drummond’s Secret Police is a 1939 English Castle murder mystery film directed by James P. Hogan, based on the H. C. McNeile novel Temple Tower. It is one of many films featuring the British sleuth and adventurer Bulldog Drummond.

The story is set 28 miles outside London in Rockingham, as a sign on the railroad station states.

Plot
An absent-minded Professor Downie (Forrester Harvey) makes a call upon Capt. Hugh “Bulldog” Drummond (John Howard) as he is making plans for his much-delayed wedding to fiancee Phyllis Claverling (Heather Angel) in his ancestral home Temple Tower.

The professor informs Drummond that a fortune was buried in one of the walled off storerooms underneath his estate, and that Downie was in possession of a book written in code that would lead them to discover the treasure. Unfortunately for the professor, someone else also wanted the riches and Drummond once again is dragged into the plot as the code book is stolen, Professor Downie is murdered, and Phyllis is kidnapped.

Cast
Heather Angel as Phyllis Clavering
John Howard as Captain Hugh C. “Bulldog” Drummond
H.B. Warner as Colonel Nielson
Reginald Denny as Algy Longworth
E.E. Clive as Tenny
Elizabeth Patterson as Aunt Blanche
Leo G. Carroll as Henry Seaton/Andrew Boulton
Forrester Harvey as Professor Downie
Clyde Cook as Constable Hawkins
David Clyde as Constable Jenkins
Neil Fitzgerald as Station Master
Elspeth Dudgeon as Housekeeper
Louise Campbell as Woman in Drummond’s Dream (uncredited)