The Secret Adversary

Directed by Tony Wharmby

Written by Pat Sandys, Agatha Christie (novel)

Cast: James Warwick as Tommy Beresford, Francesca Annis as Tuppence Cowley, George Baker as Whittington

Released 1983

Two old friends meet again and decide to earn a living as private investigators. Their first real case gets them in the hunt for a missing treaty going up against Bolshevics.