4 books in series

Operation Otherworld

Operation Otherworld is a 4-book series with 3 primary works first released in 1953 with contributions by Poul Anderson.

Operation Chaos
#1

1971 • 7 Readers • 211 pages • 4

Operation Luna
#2

1999 • 2 Readers • 438 pages

Three Hearts and Three Lions
#2.5PopularFirst

1953 • 25 Readers • 177 pages • 3.6

A Midsummer Tempest
#3

1974 • 10 Readers • 207 pages • 4