From Publishers Weekly:
Two-time Caldecott winner Wiesner (Tuesday; The Three Pigs) crafts another wordless mystery, this one set on an ordinary beach and under an enchanted sea. A saucerlike fish's eye stares from the exact center of the dust jacket, and the fish's scarlet skin provides a knockout background color. First-timers might not notice what's reflected in its eye, but return visitors will: it's a boxy camera, drifting underwater with a school of slim green fish.
In the opening panels, Wiesner pictures another close-up eye, this one belonging to a blond boy viewing a crab through a magnifying glass. Visual devices binoculars and a microscope in a plastic bag rest on a nearby beach towel, suggesting the boy's optical curiosity. After being tossed by a wave, the studious boy finds a barnacle-covered apparatus on the sand (evocatively labeled the "Melville Underwater Camera"). He removes its roll of film and, when he gets the results, readers see another close-up of his wide-open, astonished eye: the photos depict bizarre undersea scenes (nautilus shells with cutout windows, walking starfish-islands, octopi in their living room la Tuesday's frogs).
A lesser fantasist would end the story here, but Wiesner provides a further surprise that connects the curious boy with others like him. Masterfully altering the pace with panel sequences and full-bleed spreads, he fills every inch of the pages with intricate, imaginative watercolor details. New details swim into focus with every rereading of this immensely satisfying excursion.