| title | ISBN-13 | year of publica- tion |
|---|---|---|
| At High Risk | 978-0-7088-2463-4 | 1984 |
| Bitter Betrayal | 978-0-00-224187-8 | 1993 |
| Clash of Loyalties | 978-0-00-223318-7 | 1988 |
| Climate for Conspiracy | 978-0-00-221140-6 | 1974 |
| Cue for Conspiracy | 978-0-00-223967-7 | 1992 |
| Double Deceit | 978-0-00-223645-4 | 1990 |
| Limited Options | 978-0-00-223080-3 | 1987 |
| Matter of Conscience | 978-0-00-222950-0 | 1986 |
| Sleep of Spies | 978-0-00-222496-3 | 1979 |
| Turn of Traitors | 978-0-00-222398-0 | 1981 |