Department Z

1 The Death Miser (1933)
2 Redhead (1933)
3 First Came a Murder (1934)
4 Death 'round the Corner (1935)
5 The Mark of the Crescent (1935)
6 Thunder in Europe (1936)
7 The Terror Trap (1936)
8 Carriers of Death (1937)
9 Days of Danger (1937)
10 Death Stands By (1938)
11 Menace! (1938)
12 Murder Must Wait (1939)
13 Panic! (1939)
14 Death by Night (1940)
15 The Island of Peril (1940)
16 Sabotage (1941)
17 Go Away Death (1941)
18 The Day of Disaster (1942)
19 Prepare for Action (1942)
20 No Darker Crime (1943)
21 Dark Peril (1944)
22 The Peril Ahead (1946)
23 The League of Dark Men (1947)
24 The Department of Death (1949)
25 The Enemy Within (1950)
26 Dead or Alive (1951)
27 A Kind of Prisoner (1954)
28 The Black Spiders (1957)