Carl Chesterfield wishes he could speak up - whether that means being honest with his father about the family's new (and failing) food truck, reaching out to a potential friend, or alerting others to the fact that monsters might be secretly overrunning his hometown of Pittsburgh. There's plenty to fret over. And plenty to question.When a flyer about a mysterious monster-seeking group called the Midnight Brigade catches his eye, Carl sees an opportunity to find answers. Little does he know, his curiosity will lead him to find an incredible discovery under one of his city's magnificent bridges and to be bolder than he ever imagined.