The wisdom of crocodiles

When Stephen Grlscz saves a young woman from throwing herself in front of a train, he finds himself consumed by a love affair which transforms her from a suicidal, angry anorexic into a happy, beautiful young woman. Then she vanishes without trace. Across the Thames on the morning George Winnicott, former head of the Anti-Terrorist Squad, is to begin his new job in charge of the City of London. Later that day, a huge bomb explodes in the centre of London. How are these linked?