Missa, Modo and Marlow

"All right — pick the trick," Missa said, and her voice wobbled only a little on the way out.

"The missing-digit one," the skeptic said at once. "The one where you pretend to read minds. Here." He strode to the board and scrawled a big number across it, six digits long, then pressed his thumb flat over one of them so it vanished. "Tell me the digit I'm covering. And before you ask — no, you can't peek under my thumb."

Missa looked at the digits he'd left showing and began adding them together in her head, the way she always did, letting the running total climb one digit at a time. When she reached the sum she paused, and thought about the very next step up — the next full multiple of nine sitting just above where she'd landed.

"You're hiding a seven," she said.

He lifted his thumb. A seven stared back. The room made its rainstorm sound, delighted, and the skeptic's smile shifted — still doubting, but curious now, the way a person gets curious right before they get stubborn. "Lucky guess," he said. "Or memorized. Do it again."

So she did it again. And again, and again after that. Each time he wrote a fresh number and hid a fresh digit, and each time Missa quietly summed the ones she could see and named the one she couldn't — steady, unhurried, right every single time.

"That is not luck," the skeptic admitted at last, lowering his hand. "I'll grant you that. But I don't believe for one second it's magic, either. So what is it, exactly?"

This, as it happened, was the moment the whole crew loved best of all. Modo stepped forward into the light — Modo, who lived down in the machinery underneath every trick, who was never happier than when someone finally asked how.

"It's a clock," Modo said. "But not an ordinary one. A clock with nine hours on its face instead of twelve. Watch." He drew a small circle on the board and marked it around the rim, zero through eight, then let the numbers keep looping — nine landing back on zero, ten back on one, around and around. "Here's the strange and wonderful part: every whole number, no matter how enormous, comes to rest somewhere on this nine-clock. And a number's digits, added together, land on the exact same spot the whole number does. So when Missa sums up the digits you left showing, what she's really doing is finding out where your number is sitting on the nine-clock. The digit you covered is simply however far it is from there to the next full lap around — the shortfall up to the next nine."

He tapped the circle twice. "You can't hide from the clock. Whichever digit you choose to cover, it turns out to be exactly the piece that was missing to carry the lap around cleanly. That's the reason she can never be wrong — not merely usually-right, not lucky on a good night. The reason underneath makes it certain."

The skeptic was silent for a long moment. Then he turned his head toward the wing, where Marlow stood with both hands pushed down into their pockets, quite plainly staying put.

"You're the one in charge back there," the skeptic said. "So why didn't you just march out here, do the trick yourself, and shut me up in ten seconds?"

Marlow smiled at that, unhurried. "Because then you would have watched me," they said, "and you'd have walked out of here having learned exactly nothing. If I perform the trick for the crew — or for you — the reason stays mine. It never once becomes yours." Marlow nodded toward Missa and Modo, standing shoulder to shoulder in the light. "My whole job, the only job that matters, is to keep coaxing those two into saying the why out loud, over and over, until the why finally belongs to them and not to me. A trick I perform at you is a mystery you go home puzzling over. A trick you actually understand is a tool you get to keep."

The skeptic slowly unfolded his arms.