Assassin's Orbit by John Appel

Murder makes unlikely allies.
On the eve of the planet Ileri's historic vote to join the Commonwealth, the assassination of a government minister threatens to shatter everything. Private investigator Noo Okereke and spy Meiko Ogawa join forces with police chief Toiwa to investigate - and discover clues that point disturbingly toward a threat humanity thought they had escaped.
A threat that could destroy Ileri and spark an interplanetary war... unless the disparate team can work together to solve the mystery.

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