"Patience, doctor," I murmured and slipped him the packet of bills. He broke the bank wrapper and began to count them with quick, caressing touches of his fingers. "Waste of time doing that," I told him, but he kept right on. "I've taken the liberty of writing "STOLEN" on each bill, with ink that will fluoresce when the bank puts it under the ultraviolet." This stopped the counting all right, and drained him white at the same instant. I ought to warn him about the old ticker, that's the way he would pop off if he didn't watch out. "What do you mean, stolen?" he choked after a bit. "Well they were, you know. All of the money I paid you with was stolen." His face went even whiter and I was sure he would never reach fifty, not with circulation like that. "You shouldn't let it worry you. The other stuff was all in old bills. I've passed a lot of it without any trouble." "But ... _why_?" he finally squeezed out. "Sensible question, doctor. I've sent the same amount--in untampered bills, of course--to your old friend Zina. I felt you owed her that much at least, after all she has done for you. Fair is fair you know." He glared at me while I tossed all the machines, surgical supplies and such off the cliff. I was careful not to have my back to him when he was too close; other than this all the precautions had already been taken. When I glanced up by chance and saw that a covert smile had replaced the earlier expression, I knew it was time to reveal the rest of my arrangements. "An air cab will be here in a few minutes; we'll leave together. I regret to inform you that there won't be enough time after we arrive in Freiburbad for you to seek out Zina and thrash her as planned, and get the money back." His guilty start proved that he was really an amateur at this sort of thing. I continued, hoping he would be grateful for this complete revelation of how to do things in an efficient criminal manner. "I've timed everything rather carefully from here on in. Today is a bit unusual in that there are two starships leaving the port within minutes of each other. I've booked a ticket on one for myself--here is your ticket on the other. I've paid in advance for it, though I don't expect you to thank me." He took the ticket with all the spirited interest of an old maid picking up a dead snake. "The need for speed--if you will pardon the rhyme--is urgent. A few minutes after your ship leaves an envelope will be delivered to the police describing your part in this operation."