“Most time machines won’t fit through a book,” I said. “The book is the window for the magic, meaning we can’t create anything larger. And no, we can’t just create a twenty-foot-wide copy of The Time Machine by H. G. Wells. Otherwise I’d have taken my own personal spaceship to the moon years ago. How much do you know about libriomancy?”

“Not that much,” she admitted.

I swerved around a suicidal woodchuck, earning a cranky shout from the trunk. “Go to sleep, Ted!” To Lena, I said, “What we do is no different than any other magic. At its heart, magic is a two-part process: access and manifestation. Few people can tap into magical energy. Those who manage usually can’t control the manifestation. The magic fizzles, or if they’re really unlucky, it fries their minds.

“I can touch magic, but I can’t shape and define it on my own the way a true sorcerer could. The key to libriomancy, the secret Gutenberg unlocked, was that when hundreds or thousands of people read a book in the exact same form, it creates a pool of belief anchored to that form. Gutenberg did it with roughly two hundred copies of his Bible. Most of us need thousands.”

“So an oversized book wouldn’t work unless you printed and distributed thousands of them,” Lena said. “So why not pay off some author to write about a handheld time machine?”

“Gutenberg’s a bit paranoid about anything that could, in theory, be used to erase him from existence. The Porters do have a few ghostwriters on payroll, but putting in a request requires a stack of paperwork like you wouldn’t believe. Between the speed of bureaucracy and the speed of publishing, if I requisitioned a toy like that today, the book might come out three years from now. And then there’s the magical cost of trying to change time. I’d have to work through the equations, but that much power could easily burn you out of existence.”

I gunned the engine, pulling into the passing lane and putting an SUV towing a pontoon boat behind us. It would be hours before we reached the bridge, and longer yet to arrive in East Lansing. Meaning there was time to ask Lena something that had been bothering me. “You’ve known Doctor Shah a long time, right?”

“She took me in when the Porters found me. I watch her back, especially when she gets called in to consult on the ugly cases. Remember that big oil spill down south? We spent two weeks down there, working with a displaced family. My job was to keep the family from eating Nidhi. You do not want to trigger a mermaid with full-blown PTSD.”

“So you’ve met a lot of Porters,” I said.

“Nidhi doesn’t share the details of her cases, but I see most of her clients at least in passing.”