Book excerpt: In the last decade over 6,000 rhinos have been killed in South Africa. Relentless poaching for their horns has led to a catastrophic fall in black rhino numbers. Meanwhile a corrupt South African government turns a blind eye to the international trade in rhino horn. This is the background to Peter Hain's brilliantly pacey and timely thriller. Battling to defend the dwindling rhino population, a veteran freedom fighter is forced to break his lifetime loyalty to the ANC as he confronts corruption at the very highest level. The stakes are high. Can the country's ancient rhino herd be saved from extinction by state-sponsored poaching? Has Mandela's 'rainbow nation' been irretrievably betrayed by political corruption and cronyism?