- (1984) Novel: "Ride a Pale Horse"
- (1982) Novel: "Cloak of Darkness"
- (1980) Novel: "The Hidden Target"
- (1978) Novel: "Prelude to Terror"
- (1976) Novel: "Home Is the Hunter"
- (1976) Novel: "Agent in Place"
- (1974 Novel: "Snare of the Hunter"
- (1971) Novel: "Message from Malaga"
- (1966) Novel: "Double Image"
- (1960) Novel: "Decision at Delphi"
- (1958) Novel: "North from Rome"
- (1955) Novel: "Pray for a Brave Heart"
- (1953) Novel: "I and My True Love"
- (1951) Novel: "Neither Five Nor Three"
- (1949) Novel: "Rest and Be Thankful"
- (1947) Novel: "Friends and Lovers"
- (1945) Novel: "Horizon"
- (1944) Novel: "The Unconquerable" (aka "While Still We Live")
- (1940) Novel: "Triple Threat"
- (1942) Novel: "Assignment in Brittany". NOTE: Filmed as Assignment in Brittany (1943).
- (1941) Novel: "Above Suspicion". NOTE: Filmed as Above Suspicion (1943).
- (1953) Novel: "The Venetian Affair". NOTE: Filmed as The Venetian Affair (1966).
- (1968) Novel: "The Salzburg Connection". NOTE: Filmed as The Salzburg Connection (1972)
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