Watch Covert Action (1978) Official Trailer

Janssen plays an ex-CIA agent who has become an author, writing both non-fiction exposes (Phillip Agee was in the news at this time) and fiction spy novels. The CIA is on his case, in the person of Arthur Kennedy, CIA chief in Athens, where Janssen is staying. Janssen is pursuing a case that interests him, while dodging the traps set for him by Kennedy and trying to help Maurizio Merli, a former colleague with personal problems.