Picture a summer stolen whole from some coming-of-age film set in small-town 1950s. This is none of Ireland’s subtle seasons mixed for a connoisseur’s palate, watercolor nuances within a pinch-sized range of cloud and soft rain; this is summer full-throated and extravagant in a hot pure silkscreen blue. This summer explodes on your tongue tasting of chewed blades of long grass, your own clean sweat, Marie biscuits with butter squirting through the holes and shaken bottles of red lemonade picnicked in tree houses. It tingles on your skin with BMX wind in your face, ladybug feet up your arm; it packs every breath full of mown grass and billowing wash lines; it chimes and fountains with birdcalls, bees, leaves and football-bounces and skipping-chants, One! two! three! This summer will never end. It starts every day with a shower of Mr. Whippy notes and your best friend’s knock at the door, finishes it with long slow twilight and mothers silhouetted in doorways calling you to come in, through the bats shrilling among the black lace trees. This is Everysummer decked in all its best glory.

Picture an orderly little maze of houses on a hill, only a few miles from Dublin. Someday, the government declared, this will be a buzzing marvel of suburban vitality, a plan-perfect solution to overcrowding and poverty and every urban ill; for now it is a few handfuls of cloned semi-detacheds, still new enough to look startled and gauche on their hillside. While the government rhapsodized about McDonald’s and multiscreens, a few young families—escaping from the tenements and outdoor toilets that went unmentioned in 1970s Ireland, or dreaming big back gardens and hopscotch roads for their children, or just buying as close to home as a teacher’s or bus driver’s salary would let them—packed rubbish bags and bumped along a two-track path, grass and daisies growing down the middle, to their mint-new start.

That was ten years ago, and the vague strobe-light dazzle of chain stores and community centers conjured up under “infrastructure” has so far failed to materialize (minor politicians occasionally bellow in the Dáil, unreported, about shady land deals). Farmers still pasture cows across the road, and night flicks on only a sparse constellation of lights on the neighboring hillsides; behind the estate, where the someday plans show the shopping center and the neat little park, spreads a square mile and who knows how many centuries of wood.

Move closer, follow the three children scrambling over the thin membrane of brick and mortar that holds the wood back from the semi-ds. Their bodies have the perfect economy of latency; they are streamlined and unselfconscious, pared to light flying machines. White tattoos—lightning bolt, star, A—flash where they cut Band-Aids into shapes and let the sun brown around them. A flag of white-blond hair flies out: toehold, knee on the wall, up and over and gone.

The wood is all flicker and murmur and illusion. Its silence is a pointillist conspiracy of a million tiny noises—rustles, flurries, nameless truncated shrieks; its emptiness teems with secret life, scurrying just beyond the corner of your eye. Careful: bees zip in and out of cracks in the leaning oak; stop to turn any stone and strange larvae will wriggle irritably, while an earnest thread of ants twines up your ankle. In the ruined tower, someone’s abandoned stronghold, nettles thick as your wrist seize between the stones, and at dawn rabbits bring their kittens out from the foundations to play on ancient graves.

These three children own the summer. They know...