Dad has posted a list of chores for the family to do before grandma comes, including bathing the cat; but the cat does not want a bath, so she mixes up the instructions, and soon the family is mowing the floor, vacuuming the lawn, mopping the baby--and the house is in chaos.

"When Venetia Burney's grandfather reads aloud from the newspaper about a new discovery--a "ninth major planet" that has yet to be named--her eleven-year-old mind starts whirring. She is studying the planets in school and loves Roman mythology. "It might be called Pluto," she says, thinking of the dark underworld. Grandfather loves the idea and contacts his friend at London's Royal Astronomical Society, who writes to scientists at the Lowell Observatory...