detects vampires

It came out harsh enough that my brother flinched, though it was a subtle motion. "Okay," he said. "Let's - "
His head whipped around toward Rudolph's house.
"What?" I asked.
He held up a hand for silence, turning to focus intently. "Breaking glass," he murmured. "A lot of it."
"Harry!" Molly called.
I turned to see the Beetle's passenger door swing open. Molly emerged, hanging on to Mouse's collar with both hands. The big dog was focused on Rudolph's house as well, and his chest bubbled with the deep, tearing snarl I'd heard only a handful of times, and always when supernatural predators were nearby.
"Someone's there for Rudolph," I said, and launched myself forward. "Let's go!"


Changes Chapter 24, Page 234