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Series
Men at war
7 books in the catalogue
Book 1
The last heroes
William E. Butterworth III
Book 2
The secret warriors
William E. Butterworth III
Book 3
The Soldier Spies
William E. Butterworth III
Book 7
The spymasters
William E. Butterworth III, William E. Butterworth IV
The Saboteurs
William E. Butterworth III, William E. Butterworth IV
The fighting agents
William E. Butterworth III
The Double Agents
William E. Butterworth III, William E. Butterworth IV
Book data and covers from Open Library (openlibrary.org).