Sperling jerked impatiently in his chair. Wolfe looked at him as a sixth-grade teacher looks at a restless boy, moved his eyes for a roundup of the whole audience, and went on: “If you think I am describing an extraordinary man, I am indeed. How, for instance, does he maintain the gap? There are two ways to catch a criminal: one, connect him with the crime itself; or two, prove that he knowingly took a share of the spoils. Neither is feasible with X. Take for illustration a typical crime-anything from a triviality like pocket picking or bag snatching up to a major raid on the public treasury. The criminal or gang of criminals nearly always takes full responsibility for the operation itself, but in facing the problem of disposal of the loot, which always appears, and of protection against discovery and prosecution, which is seldom entirely absent, he cannot avoid dealing with others. He may need a fence, a lawyer, a witness for an alibi, a channel to police or political influence-no matter what; he will almost inevitably need someone or something. He goes to one he knows, or knows about, one named A. A, finding a little difficulty, consults B, We are already, observe, somewhat removed from the crime, and B now takes us still further away by enlisting the help of C. C, having trouble with a stubborn knot in the thread, communicates with D. Here we near the terminal. D knows X and how to get to him.