Skylark DuQuesne by E.E. Doc Smith (Skylark Series, Book 4) from Books In Motion.com
Description:
Dick Seaton & Marc DuQuensne are the deadliest enemies in the Universe--their feud has blazed among the stars & changed the history of a thousand planets. But now a threat from outside the Galaxy drives them into a dangerous alliance as hordes of strange races drive to a collision with mankind. Seaton & DuQuensne flight & slave side by side to fend off the invasion--as Seaton keeps constant, perilous watch for DuQuesne's inevitable double-cross.
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