"There's a goddess of the river," I said. "Yes--Mother Thames," he said patiently. "And there's a god of the river--Father Thames." "Are they related?" "No," he said. "And that's part of the problem." "Are they really gods?" "I never worry about the theological questions," said Nightingale. "They exist, they have power and they can breach the Queen's Peace--that makes them a police matter." A"