The Benson boys return to Buckman for spring vacation and concoct a prank involving a non-existent ghost, continuing the practical joke war between the Hatford boys and the Malloy girls.
In Cobtown in 1845, ten-year-old Lucky describes in her diary how mysterious and terrifying screams lead to the discovery of a little striped piglet whom the townspeople name Oinkey.
Young Sarah, with the help of her friend Billy the Ghost, proves herself as a deputy by planning the perfect capture of two bank robbers in her Western town of Cactus Junction.