Skylark Duquesne (Skylark Series, Book 4)

Dick Seaton and Marc DuQuesne are the deadliest enemies in the Universe. Their feud has blazed among the stars and changed the history of a thousand planets.

Now a threat from outside the Galaxy drives them into a dangerous alliance as hordes of strange races drive inward, colliding with the Milky Way's civilizations.

Seaton and DuQuesne fight side-by-side, slaving to create newer, mightier devices for defense and destruction, as Seaton keeps alert for DuQuesne's inevitable double cross.