Sailor's Honour

Pierre de Villiers has walked a hard road. Tortured by his own army, his family killed, surviving cancer; his new life in New Zealand is supposed to bring him peace.
But just when his life seems to be on an even keel, his daughter is kidnapped in Auckland and his brother-in-law's wife abducted in Durban. What possible common enemy might the brothers-in-law have? The clues to the riddle stret...