A Hooded Crow by Craig Thomas

While Kenneth Aubrey of British Intelligence recuperates from illness, his best men, Patrick Hyde and Tony Godwin, are obsessively in pursuit of proof of East European infiltration of the electronics giant Reid Group, whose former chairman is a cabinet minister. No one believes that their accusations that Reid Group has been penetrated and it's secrets stolen, and they are suspended from duty.
In a remote part of the Namibian bush, former British agent Richard Anderson discovers the wreckage of an Air Craft belonging to Paulus Malan's huge MLC conglomerate. On board is Reid Group technology and the body of a KGB officer. When Anderson sends evidence of the cargo to Aubrey, Malans men destroy his home in a fake terrorist atrocity, killing Anderson's beloved half-Bantu wife.
Aubrey is drawn reluctantly into involvement with Hyde's investigations and Anderson's desire for revenge, discovering that something more sinister is on it's way to Africa via a trade fair in Venice.
As Anderson begins track down Paulus Malan, the reader is drawn into a world where politics are new, weapons of destruction even newer, but where tactics and risks are old and as deadly as ever.