Alec McCowen, Agatha Christie, Francesca Annis, Gavan O'Herlihy, James Warwick, Tony Wharmby, Pat Sandys

The Secret Adversary is a TV movie starring James Warwick, Francesca Annis, and Gavan O'Herlihy. After two old friends accidentally meet and resolve to become investigators for hire, they quickly become embroiled in a missing treaty...