“The one thing,” Ryan repeated. It was a private bit of shorthand. The one thing to break a case could be a name, an address, the description or tag number of a car, a person who knew something. Always the same, though frequently different, it was for the detective the crucial piece in the jigsaw puzzle that made the picture clear, and for the suspect the brick which, taken from the wall, caused everything to fall apart. And it was out there. Ryan was sure of it. It had to be there, because this killer was a clever one, much too clever for his own good.
