A delightfully harmonious mother-son collaboration from bestselling author Meg Wolitzer and audio-producer Charlie Panek about a sound-inspired scavenger hunt.

Felix used to love summer vacations, when his family would trade the bustling noise of New York City for the small-town quiet of Blissfield, Massachusetts. But summer hasn't been the same for Felix since his bad-boy big brother, Dylan, left home and his genius younger brother, Miles, started attending a camp for child prodigies.

After Felix discovers a mysterious musical clue, he joins forces with Marigold, the eccentric girl who lives next door, to follow a string of clues on a sound-related scavenger hunt through town. From experimental musicians to frequencies that turn into pictures, the pair learn that sound is so much more than what we can hear. But as the hunt builds to a crescendo, Felix begins to wonder—and worry—about the secret identity of the anonymous puzzle-maker behind the adventure.