“Can you do it?” asked the Werwolf.
Mackensen grinned. The killing kit in the trunk of his car was an assassin’s dream. It included nearly a pound of plastic explosive and two electric detonators.
“Sure,” he growled, “no problem. But to get at the car I’ll have to wait until dark.” He stopped talking, gazed out of the window of the post office, and barked into the phone, “Call you back.” He called back in five minutes. “Sorry about that. I just saw Miller, attaché case in hand, climbing into his car. He drove off. I checked the hotel, and he’s registered there all right. He’s left his traveling bags, so he’ll be back. No panic, I’ll get on with the bomb and plant it tonight.”
Miller had waked up just before one, feeling refreshed and somewhat elated. In sleeping he had remembered what was troubling him. He drove back to Winzer’s house.
The maid was plainly pleased to see him. “Hello. You again?” She beamed.
“I was just passing on my way back home,” said Miller, “and I wondered, how long have you been in service here?”
“Oh, about ten months. Why?”
“Well, with Herr Winzer not being the marrying kind, and you being so young, who looked after him before you came?”
“Oh, I see what you mean. His housekeeper, Fraulein Wendel.”
“Where is she now?”
“Oh, in the hospital. I’m afraid she’s dying. Cancer of the breast, you know, Terrible thing. That’s what makes it so funny that Herr Winzer dashed off like that. He goes to visit her every day. He’s devoted to her. Not that they ever-well, you know-did anything, but she was with him for a long time, since nineteen fifty, I think, and he thinks the world of her. He’s always saying to me, ‘Fräulein Wendel did it this way,’ and so on.”
“What hospital is she in?” asked Miller.
“I forget now. No, wait a minute. It’s on the telephone notepad. I’ll get it.” She was back in two minutes and gave him the name of the clinic, an exclusive private sanatorium just beyond the outskirts of the town.
Finding his way by the map, Miller presented himself at the clinic just after three in the afternoon.
Mackensen spent the early afternoon buying the ingredients for his bomb.
“The secret of sabotage,” his instructor had once told him, “is to keep the requirements simple. The sort of thing you can buy in any shop.” From a hardware store he bought a soldering iron and a small stick of solder; a roll of black insulating tape; a yard of thin wire and a pair of cutters; a one foot hacksaw blade and a tube of instant glue. In an electrician’s he acquired a nine-volt transistor battery; a small bulb, one inch in diameter; and two lengths of fine single-strand, five-amp plastic-coated wire, each three yards long, one colored red and the other blue. He was a neat man and liked to keep positive and negative terminals distinct. A stationer’s supplied him with five erasers of the large land, one inch wide, two inches long, and a quarter of an inch thick. In a drugstore he bought two p of condoms, each containing three rubber sheaths, and from a high-class grocer he got a canister of fine tea. It was a 250-gram can with a tight-fitting lid. As a good workman, he hated the idea of his explosive getting wet, and the tea can’s lid would keep out the air, let alone the moisture-with his purchases made, he took a room in the Hohenzollern Hotel overlooking the square, so that he could keep an eye on the parking area, to which he was certain Miller would return, while he worked.
Before entering the hotel, he took from his trunk half a pound of the plastic explosive, squashy stuff like children’s plasticene, and one of the electric detonator. Seated at the table in front of the window keeping half an eye on the square, with a pot of strong black coffee to stave off his tiredness, he went to work.
It was a simple bomb he made. First he emptied the tea down the toilet and kept the can only. In the fid he jabbed a hole with the handle of the wire clippers. He took the nine-foot length of red wire and cut a ten-inch length off it.
One end of this short length of red-coated wire he spot-soldered to the positive terminal of the battery.
To the negative terminal he soldered one end of the long, blue-colored wire. To ensure that these wires never touched each other, he drew one down each side of the battery and whipped both wires and battery together with insulating tape.
The other end of the short red wire was twirled around the contact point on the detonator. To the same contact point was fixed one end of the other, eight-foot piece of red wire.
He deposited the battery and its wires in the base of the square tea can, embedded the detonator deep into the plastic explosive, and smoothed the explosive into the can on top of the battery until the can was full.
A near-circuit had now been set up. A wire went from the battery to the detonator. Another went from the detonator to nowhere, its bare end in space. From the battery, another wire went to nowhere, its bare end in space but when these two exposed ends, one of the eight-foot-long red wire, the other of the blue wire, touched each other, the circuit would be complete. The charge from the battery would fire the detonator, which would explode with a sharp crack. But the crack would be lost in the roar as the plastic went off, enough to demolish two or three of the hotels bedrooms.
The remaining device was the trigger mechanism. For this he wrapped his hands in handkerchiefs and bent the hacksaw blade until it snapped in the middle, leaving him with two six-inch lengths, each one perforated at one end by the small hole that usually fixes a mackinaw blade to its frame.
He piled the five erasers one on top of another so that together they made a block of rubber. Using this to separate the halves of the blade, he bound them along the upper and lower side of the block of rubber, so that the six-inch lengths of steel stuck out, parallel to each other and one and a quarter inches apart. In outline they looked rather like the jaws of a crocodile. The rubber block was at one end of the lengths of steel, so four inches of the blades were separated only by air. To make sure there was a little more resistance than air to prevent their touching, Mackensen lodged the light bulb between the open jaws, fixing it in place with a generous blob of glue. Glass does not conduct electricity.
He was almost ready. He threaded the two lengths of wire, one red and one blue, which protruded from the can of explosive through the hole in the lid and replaced the lid on the can, pushing it firmly back into place.
Of the two pieces of wire, be soldered the end of one to the upper hacksaw blade, the other to the lower blade. The bomb was now live.
Should the trigger ever be trodden on, or subjected to sudden pressure, the bulb would shatter, the two lengths of sprung steel would close together, and the electric circuit from the battery would be complete.
There was one last precaution. To prevent the exposed hacksaw blades from ever touching the same piece of metal at the same time, which would also complete the circuit, he smoothed all six condoms over the trigger, one on top of another, until the device was protected from outside detonation by six layers of thin but insulating rubber. That at least would prevent accidental detonation.
His bomb complete, he stowed it in the bottom of the wardrobe, along with the binding wire, the clippers and the rest of the sticky tape, which he would need to fit it to Miller’s car. Then he ordered more coffee to stay awake and settled down at the window to wait for Mile; a return to the parking lot in the center of the square. He did not know where Miller had gone, nor did he care. The Werwolf had assured him there were no leads he could pick up to give him the whereabouts of the forger, and that was that. As a good technician, Mackensen was prepared to do his job and leave the rest to those in charge. He was prepared to be patient. He knew Miller would return sooner or later.