THE SQUARE CIRCLE

1982

From blurb of Bantam edition:

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She has a cause she'd die for -- and a face men would kill for.

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He has no loyalties except to himself -- and to the highest bidder for his services.

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She hires him to forge the deadliest team of mercenaries the world has known --  and the wild geese are ready to fly again.

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THE RETURN OF THE WILD GEESE

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For forty years, four superpower armies have kept a deathwatch in Spandau prison -- a private prison for one man, once a brutal butcher, now a bitter ghost. In the cause of international human rights, the Wild Geese must pluck Rudolph Hess out of the heart of the most heavily guarded fortress in Europe.