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Pseudonym of Heidi Huberta Freybe Loewengard. She was born in Rostock, Germany. In 1937, she moved to the USA and in 1947 she became a naturalized American citizen. She was married twice, to Sydney J. Lamon and to Josef Maria Loewengard. |
Titles and year of publication:
| 1) No Surrender | 1942 |
| 2) Without Orders | 1943 |
| 3) Endure No Longer | 1944 |
| 4) None Shall Know | 1945 |
| 5) Remembered Anger | 1946 |
| 6) Whispering Hill | 1947 |
| 7) After Midnight | 1949 |
| 8) Wait for the Dawn | 1950 |
| 9) Desperate Moment | 1951 |
| 10) The Hunted Woman | 1952 |
| 11) Nightmare in Copenhagen | 1954 |
| 12) The Mask of Alexander | 1955 |
| 13) The Linden Affair (UK Title: The Story That Could Not Be Told [1956]) | 1957 |
| 14) A Day in Monte Carlo | 1959 |
| 15) Meet Me Tonight (Also published as: Return to Terror [1964]) | 1960 |
| 16) A Call from Austria | 1963 |
| 17) A Door Fell Shut | 1966 |
| 18) Rhine Replica | 1969 |
| 19) Manhattan North | 1971 |
| 20) Zürich/AZ 900 | 1974 |
| 21) A Taste of Terror | 1976 |
| 22) Final Encore (UK Title: Intermission [1978]) | 1978 |