Possibly based on Dickens' Shylock, the twists and turns of the main character are paralleled by those of the plot, which goes from Victorian England to Australia and Tasmania. Anyone who has visited either of these two places will meet the main character in Richmond jail, and will never be able to be dispassionate about our 'moral' punitive system of justice again.
Don't let the length of this book dissuade you, it is obligatory reading for anyone with a social conscience as well as travellers to the Antipodes. Once started it grips you until the end, and it will stay with you long after you have put it down.