Some books appropriate for a fourth-grade reading level include "Plum," "Sideways Stories From Wayside School" and "Golem." A few others to consider include the "Geronimo Stilton" series, Judy Blum's "Fudge Box" set and "The Kid Who Only Hit Homers."
"Plum" by Tony Mitton includes a collection of poems that introduces fourth-grade readers to a genre of writing often hard to understand. It provides entertainment but also teaches readers about different styles of poetry. "Sideways Stories From Wayside School" by Louis Sachar is a series of three books that follow the students of a school built 30 stories high. "Golem" by David Wisniewski, an advanced picture book, presents a giant clay man who comes to life to protect the Jewish people of Prague.
The "Geronimo Stilton" series by Elisabetta Dami follows the adventures of a mouse named Geronimo. Geronimo and his family seek lost treasure, brave haunted houses and travel to cheese pyramids while the reader learns about the real history on which each story is based. Judy Blume's "Fudge Box" series tells the story of a boy named Fudge and his brother Peter as they grow up and try to find balance and friendship despite their sibling rivalry. "The Kid Who Only Hit Homers" by Matt Christopher, a sports-themed chapter book, features a main character who finds himself in the middle of a mystery after a strange man tells him he can make him the star of his baseball team.