Doesn't need to see the moon

"So you've got to get to MacFinn," Susan said, when I was finished, "before the moon comes up and he transforms. "
"You've got it," I said.
"Why don't you call Murphy? Tell her what's going on?"
I shook my head. "Murphy isn't going to be in the mood to listen. She busted me and I fled arrest. She'd have me in a cell before I could say abracadabra. "
"But it's raining," Susan protested. "We won't be able to see the moon tonight. Won't that stop MacFinn from changing?"
I blinked at the question and glanced back at Tera. She was watching the buildings pass out the side window as the streetlights started flickering on. She didn't look at me, but shook her head.
"No such luck," I told Susan. "And with these clouds, I can't even tell if the sun has gone down yet, much less how much time we have before moonrise. "
Susan breathed out slowly. "How are you going to get to MacFinn, then?"

Fool Moon Chapter 16, Page 181-182