When a rainstorm prevents Nancy and her best friend, Robert, from getting to the planetarium the night of a class field trip, she has a brilliant idea for making things better.

Eating too much pie causes Llama to rip his dancing pants, opening a black hole and threatening the entire universe.

"With the doomsday asteroid looming, Detective Hank Palace has found sanctuary in the woods of New England, secure in a well-stocked safe house with other one-time members of the Concord police force. But with time ticking away before the asteroid makes landfall, Hank's safety is only relative, and his only relative--his sister Nico--isn't safe. Soon, it's clear that there's more than one earth-shattering revelation on the horizon, and it's up to...

Struggling with grief over her uncle's death, twelve-year-old amateur astronomer Tuesday Beals makes a discovery that could save her favorite astronomy spots in Zion National Park from the threat of a new housing development.

Mr. Kazarian's evil cousin Kronkhold has a black hole generator, and it is up to the alien librarian and the four students who know his secret to stop Kronkhold before his device swallows Earth, and the rest of the solar system--and get back to Earth in time for TJ, Dani, Shea, and Walden to make their class presentation on Albert Einstein.

Just before spending her sixteenth summer on Cape Cod, Sarah's boyfriend breaks up with her and, as a scientist whose focus is on winning a scholarship through her study of a comet, she designs an experiment to become more like her older sister to see ifshe, too, can be popular.