The colonel reached into a drawer and pulled out a fat jacket bulging with papers, photostats, and interdepartmental reports. "It began," he said, "about two years ago, on Io and Callisto. It spread all over the Jovian System and soured Ganymede and Europa. The symptoms were first the disappearances of several prominent citizens, followed by a wave of bankruptcies and suicides on both planetoids. Nobody complained to the police. Then a squad of our New York men picked up a petty chiseler who was trying to gouge the Jovian Corporation's Tellurian office out of a large sum of money on the strength of some damaging documents he possessed relating to a hidden scandal in the life of the New York manager. From that lead, they picked up a half-dozen other small fry extortionists and even managed to grab their higher-up--a sort of middleman who specialized in exploiting secret commercial information and scandalous material about individuals. There the trail stopped. They put him through the mill, but all he would say is that a man approached him with the portfolio, sold him on its value for extortion purposes, and collected in advance. There could be no follow up for the reason that after the first transaction what profits the local gang could make out of the dirty work would be their own." "Yes," said Neville, "I know the racket. When they handle it that way it's hard to beat. You get any amount of minnows, but the whales get away." "Right. The disturbing thing about the contents of the portfolio was the immense variety of secrets it contained and that it was evidently prepared by one man. There were, for example, secret industrial formulas evidently stolen for sale to a competitor. The bulk of it was other commercial items, such as secret credit reports, business volume, and the like. But there was a good deal of rather nasty personal stuff, too. It was a gold mine of information for an unscrupulous blackmailer, and every bit of it originated on Callisto. Now, whom do you think, could have been in a position to compile it?" "The biggest corporation lawyer there, I should guess," said Neville. "Priests and doctors know a lot of personal secrets, but a good lawyer manages to learn most everything." "Right. Very right. We sent men to Callisto and learned that some months earlier the most prominent lawyer of the place had announced one day he must go over to Io to arrange some contracts. He went to Io, all right, but was never seen again after he stepped out of the ship. It was shortly after, that the wave of Callistan suicides and business failures took place." "All right," agreed Neville, "so what? It has happened before. Even the big ones go wrong now and then."