A sound-inspired scavenger hunt and fast-paced mystery about family and friendships lost and found. “A harmonious blend of STEM intrigue and heartfelt emotion that emphasizes listening closely to what really matters.” — Kirkus , starred review Felix used to love summer vacation, when his family would trade the bustling noise of New York City for the small-town quiet of Blissfield, Massachusetts. But vacation hasn’t been the same since his big brother left home, and Felix is sure this summer is going to be the worst yet. Then he finds a mysterious box with the words OPEN ME written on the outside. Inside, there’s an audio recorder, headphones, and a list of timecodes. What does it mean? Felix and his offbeat neighbor, Marigold, follow a string of clues through town. But as the hunt builds to a crescendo, Felix begins to wonder about the identity of the anony­mous puzzle-maker behind their adventure. This delightfully harmonious mother-son collabora­tion from bestselling author Meg Wolitzer and sound editor and music producer Charlie Panek will change the way you listen to the world