Jumble Joan by Rose Impey, 1989.
A boy and his friend, Mick, take his little sister upstairs to explore their grandmother’s attic one evening. The boys are hoping to scare the girl by telling her all sorts of creepy stories about the stuff they find in the attic, but if they’re scaring anyone, it might just be themselves.
A rocking horse becomes one of the dreaded “Ten O’Clock Horses” that might drag a child off into the night if she isn’t in bed on time. An old stuffed parrot in a cage becomes “The Deadly Vampire Bat”, waiting to suck their blood. But, the most sinister creature of all might be “Jumble Joan”, who hides by pretending to be a pile of old clothes, ready to steal away any little girls who might want to play dress up in their grandmother’s attic!
Although the brother narrates the story, the pictures show that his little sister knows exactly what the boys are trying to do, and she does things to turn the situation around.
This is one of the books in the Creepies Series. Kids under the age of seven might find stories in this series a little scary because they focus on how stories about monsters can build in the imagination, even if you know that you made them up yourself. Still, all of the books have good endings, and this one is pretty funny.
This book is available to borrow and read for free online through Internet Archive.
The Flat Man by Rose Impey, 1988.
Scare Yourself to Sleep by Rose Impey, 1988.

The Mystery on October Road by Alison Cragin Herzig and Jane Lawrence Mali, 1991.
The Talking Table Mystery by Georgess McHargue, 1977.

The Ghost on the Hill by Grace Maccarone, 1990.
When they reach the state park, Dennis Ten Foot Bridge, who is the last of his tribe, tells the students about his tribe, teaches them wilderness skills, and leads them in group activities. One evening, Joey goes out to practice some rowing on the lake by himself, and he sees what looks like a large ghost at the top of a hill However, everyone knows that Joey lies about a lot of things, so at first, no one believes him. At least, no one except Adam.
The Return of the Third-Grade Ghosthunters by Grace Maccarone, 1989.
They try to use scientific methods to study the haunting. They measure the placement of the furniture to see if anything moves while they’re out and sprinkle flour on the floor to get footprints. But, even though they watch carefully and don’t see anyone enter the bunk house, when they go inside, everything is a mess, and the flour doesn’t appear disturbed. Everyone else is about ready to admit that this one is a real ghost, but Adam has another theory.
The Haunting of Grade Three by Grace Maccarone, 1984.
Most of the group members are misfits in one way or another. Norma Hamburger is a shy girl, frequently teased about her last name. Debbie Clark is a talkative girl who’s really into science. Chuck Webber, Adam’s best friend, is the class clown, always telling stupid jokes (and one of the main people who teases Norma about her name). Danny Biddicker is strong and good at sports, but he worries that he’s not as smart as the others. Joey Baker feels overshadowed by his large family, so he tells tall tales to get attention. The other kids don’t understand and get annoyed with his lies. By working together, they not only learn the secret of Blackwell House, but they learn more about each other and become a real team and friends.
Wrapped in a Riddle by Sharon E. Heisel, 1993.