During a weekend trip to Ocracoke Island, siblings Judy and Stink Moody take part in a pirate treasure-hunting game, in which various clues lead them to silver coins, or "pieces of eight," hidden across the island.

Judy Moody is making a list and checking it twice, but all her brother, Stink, wants this year is snow.
It hasn't snowed on Christmas in Virginia in more than a hundred years, so what are the chances that that will change? Enter the new mailman, Mr. Jack Frost, who not only looks like a jolly old elf but also seems to know a lot about weather patterns, has a fondness for the cold, and works looooooong hours during the holiday season.

...

"Look up! Look out! A comet is coming, a comet is coming! Stink is camped out in the backyard with his sister, Judy, and he can't wait to lay eyes on P/2015 OZ4, also known as the Sherman-Holm Comet. But then news of an asteroid hitting Russia reaches Stink, and suddenly he's feeling squeamish (and squash-ish) about close encounters of the outer-space kind. Will donning an aluminum-foil cape and building a bunker in the basement help keep him safe?...