The Bell Of Millard. Moon Over Marisol, #13

When the moon calls, Marisol answers. Even when it drops her in a field next to a thirty-foot unconscious giant with birds nesting in his hair. Assignment thirteen: Ring the bell of Millard. One problem - the bell is missing. Another problem - it was stolen by a dragon. A dragon named Chester. Who collects bells the way other dragons collect gold, except with less organization and more corrosion. The giant can't wake up without his bell.
The bell is in a cave guarded by a dragon. The dragon can't be fought because Marisol's magic won't work underground. And her only weapon is a bell expert named Orvil who has opinions about everything and social skills about nothing. Nine hundred years of cosmic community service, and it's come to this: a witch, a cat, and a campanologist walking into a dragon's lair. This is fine.