Alfred Hitchcock and The Three Investigators is a 32-book series with 32 primary works first released in 1964 with contributions by Robert Arthur, Alfred Hitchcock, and 4 others.
1964 • 8 Readers • 192 pages • 3.2
1964 • 2 Readers • 182 pages • 3
1965 • 2 Readers • 185 pages • 3.5
1966 • 2 Readers • 160 pages • 3
1967 • 2 Readers • 164 pages • 3
1968 • 2 Readers • 184 pages • 3
1974 • 1 Reader • 139 pages • 4
1978 • 1 Reader • 152 pages • 4