From the introduction:
The freak summer blizzard that buried the Hawaiian islands under four feet of snow has passed, and the day has dawned on a sunny, if cool, morning. The palm trees are frozen stiff, every frond laden with icicles. Power's still out, but the weather report on Mom's battery-powered radio says that the weather will turn warm and sunny again by tomorrow morning.
The kids down the block have spent the entire night building a grandiose snow fort in Joey's front yard. They've got two towers, icicle spikes, and a dug-out ice cave stuffed to the gills with pre-made snowballs. Atop it all, they've made a flag by affixing an old t-shirt to a broom handle. Show-offs.
Eric is conscripting an army of faithful snow-musketeers to head up the assault, Jeffrey swears he knows of a secret underground passage under the Gilman family's patio, Johnny and Suzy are sculpting our secret weapon - an honest-to-goodness flying ice dragon - and best of all Alice's mom said she'd make hot cocoa for all of us. The kind with the little marshmallows.
Fort Joey must fall, and it must fall before dawn, or else the summer heat will beat us to it.