The Riddle of Twelve Milligrams

The cat appeared at precisely 3:47 AM, materializing from the shadows of Dr. Aris Thorne's sterile laboratory like a phantom in scrubs. Not a typical cat — this creature moved with deliberate intent, tail twitching with what could only be described as intellectual curiosity.

"You're not wearing your ID badge," Aris murmured, his voice cracking from thirty-six hours without sleep. The amber-eyed creature simply blinked, as if questioning the very concept of institutional security.

Aris should have been reviewing his data. Instead, he found himself arranging the vials of experimental Compound 47 — a synthetic vitamin derivative that had shown remarkable promise in early trials. Remarkable, and disturbing. The previous three researchers had reported the same symptom before resigning: waking at 3:47 AM with the overwhelming sensation that they'd forgotten something essential, something that couldn't be written in lab notes.

The cat jumped onto the stainless steel counter, directly onto the printed safety protocols. Its paw landed on the sphinx symbol Aris had doodled in the margin during the endless ethics board meeting.

"You're not supposed to be in here," he said, reaching for the phone to call security. Then paused. The cat was staring at the compound vials with an expression that looked unsettlingly like recognition.

The riddle clicked into place with the same cold clarity as the realization that he'd been taking the vitamin supplements himself for three weeks. That the company hadn't actually received FDA approval. That the test subjects weren't developing improved memory — they were developing someone else's.

"Which version?" the cat seemed to ask with its unblinking gaze. "The one that remembers, or the one that forgets?"

Aris's hand hovered over the emergency decontamination button. In that moment, he understood the sphinx's true question: What walks on four legs in the morning, two at noon, and three in the evening? The answer wasn't man. It was memory — whole, fragmented, then supported by the pharmaceutical crutch of what you pretend you still know.

The cat purred, a sound like papers being signed, and Aris made his choice.

He didn't call security. He opened the lowest drawer, where his actual resignation letter had waited for two weeks, and placed the vitamin bottle on top of it. Some riddles, he decided, were meant to remain unanswered.

The cat was gone when he looked up again. But on the counter, exactly where it had sat, was a single bottle cap twisted open — and the compound inside, somehow, already gone.