Thomas Post is an expert on coincidences. He's an authority. People come to see him, to ask him if he can explain strange events that have befallen them, and he can always explain these things away. We poor humans, he would say, have a tendency to make patterns out of random shapes, or to construct meaning from the random behaviour of the universe. But one day Thomas gets a visit from Azalea Lewis, and his world will never be the same again.