Kojo Suzuki - Spiral

To: Dr Ando, Fukuzawa University Medical School

Here’s the note Mr and Mrs Oda left. Please let me know of any new developments.

Dr Yokota

Medical School

Joji University

Under the professor’s scrawled note were a few lines of text accompanied by the Odas’ names. The handwriting wasn’t Yokota’s; he must have made a photocopy of the original.

October 28, morning

We took it upon ourselves to dispose of the videotapes. There’s nothing more to worry about. We’re tired. Yoshimi and Kazuko, please take care of everything.

Toru Oda

Setsuko Oda

The message was short, but even so it was enough to make it clear that they knew they were facing death. Yoshimi and Kazuko were probably their other two daughters. But who had the previous sentence been addressed to?

What did they mean, they’d disposed of the videotapes?

Did it mean they’d gotten rid of them? It certainly couldn’t be taken to mean that they’d copied them.

Ando decided to try and recreate the Odas’ state of mind from the beginning.

On Sunday, October 21st, their son-in-law showed up on their doorstep and told them that Shizu and Yoko’s lives were threatened by a curse embedded in a videotape. The Odas agreed to copy the tape. But then, that same day, Shizu and Yoko died at the time foretold. Even if the Odas had been skeptical about Asakawa’s story at first, now they surely had to believe in the video’s power. Then, after the funeral, they had learned the results of the autopsies: inexplicable heart attacks. At this point the Odas must have decided to give up hope of saving themselves. Their daughter and granddaughter had lost their lives in spite of the fact that they’d followed the videotape’s demands. The Odas must have thought that they couldn’t escape death no matter what they did. Exhausted from all the effort that had gone into the funerals, and perhaps weary of life in general, they decided to refrain from copying the videotape and meekly awaited the approach of death. But if their note was to be believed, while waiting, they had “disposed” of the videotapes that were the source of all this misery.

There was no way for Ando to know how they had disposed of the tapes. They might have erased them completely and then thrown them away, or they might have buried them in the yard. In any case, as Ando now attempted to diagram the video’s path on a piece of scratch paper, he decided to grant for the moment that those two copies had been obliterated.

First there had been the one in Villa Log Cabin No. B-4, the source of all the evil, created when a VCR left to record had captured the images on tape. Asakawa had taken that back to his apartment and made a copy for Ryuji. At this point there were two copies, two strains as it were. However, it seemed that Ryuji’s copy had found its way into Mai’s hands, and had then been erased, all except for the first ten seconds. Asakawa’s copy, meanwhile, had passed to his brother Junichiro, who had discarded it along with the damaged VCR. Asakawa’s original had begotten two further strains in the form of copies given to the Odas, but these too had been disposed of. In short, the videotapes born of Sadako Yamamura’s wrath had now vanished from the face of the earth.

Ando went over the tree he’d constructed again and again, to make sure he had it right. But the tape did indeed seem to have gone extinct. A mere two months after it had come to life at the end of August, having claimed only nine victims, the scourge had died out. But… Ando thought. If the videotape killed everybody who watched it regardless of whether or not they copied it, it was obvious that it was going to go extinct sooner or later. Only by virtue of its threat would it be able to reproduce itself, to adapt to its environment and survive. Once the threat was exposed as a lie, the tape would inevitably be driven into a corner.

If it was extinct, that would mean they’d seen the last of these mysterious deaths. If nobody else could be exposed to those images, then there was no fear of anybody dying from inexplicable heart attacks. But a fundamental point now stole back into Ando’s mind.

Why is Asakawa still alive?

This was followed by another question.

Where is Mai Takano?

Logically, the videotape seemed to have died out. But Ando’s intuition denied it. This wasn’t going to be over that easily. Something didn’t sit right.

Ando picked up a locker key at the front desk of the library, and then took off his jacket on his way to the lockers. It was almost winter. Anybody who saw him, wearing nothing but a shirt, would shiver in sympathy. But Ando perspired easily, and even in his shirtsleeves, he felt hot in the climate-controlled library. He took a pen and a notebook out of his briefcase, then wrapped his jacket around it and stuffed it in a locker.

The notebook was where he’d put the page containing the DNA analysis of the virus found in Ryuji’s blood. Ando was determined to have a go at cracking the code today, which was why he was here in the library first thing in the morning, but the moment he looked at the meaningless array of letters on the printout, his eyes glazed over. There was no way he’d be able to figure this out. But when he thought about it, he recalled that he was doing this partly to kill time. He couldn’t think of anything better to get him through the empty three-day weekend.

So he tucked the notebook under his arm and headed up to the third-floor reading room, where he took a seat by the window.

As a student playing at cipher-cracking with Ryuji, he’d had quite a collection of books on cryptography at home. But what with getting married and then getting divorced, he’d moved three times since then, not to mention the fact that he’d lost interest in the subject; all those books had disappeared somewhere along the line. There were certain types of codes that he couldn’t hope to decipher without the help of character substitution charts and letter-frequency graphs of the kind found in specialist works, and he doubted he’d be able to get anywhere on this one without their help. And since it just seemed foolish to buy them all over again, he’d ended up at the library.

At one point he’d had a good grasp of the basics of constructing and unscrambling codes, but it had been ten years, so he first took a quick glance through a primer on the subject. He decided that his first step should be to decide just what class of code was contained in the smallpox-like virus’s base sequence.

Codes can be generally divided into three types: substitution ciphers, in which the letters of the message are replaced by other letters, symbols, or numbers; transposition ciphers, in which the order of the words of the message is changed; and insertion ciphers, in which extraneous words are inserted between the words of the message. The numbers that popped out of Ryuji’s belly after the autopsy, which Ando was able to link to the English word “ring”, was a good example of a simple substitution cipher.

It didn’t take him long to guess that the virus’s code had to be of the substitution variety. What he had to work with was a group of four letters, ATGC, corresponding to the four bases, so it was most likely that the code consisted of assigning a particular character to a predetermined grouping of letters. That was most code-like.

Code-like. When the thought occurred to him, it made him sit up and think. The essential purpose of a code is to convey information from one party to another without any third party being able to figure it out. As students, codes had been nothing but a game to them, brain-teasers. But in, say, times of war, when a code’s susceptibility to deciphering could sway the tide of a conflict, a “code-like” code would mean one which was, in effect, too dangerous to use. In other words, one way to keep the enemy from breaking your codes was to make sure they didn’t look like codes at first glance. If you caught an enemy spy and found he was carrying a notebook filled with suspicious looking strings of numbers, it would be a safe bet that it was top-secret informatin, encrypted.