Sweet Valley Twins & Friends (2-Pack Vintage Paperbacks) by Francine Pascal - Carnival Ghost, Big Camp Secret

Super Chiller: The Carnival Ghost 

A traveling carnival is on its way to Sweet valley, and Jessica and Elizabeth Wakefield can't wait to ride the roller coaster, have their fortunes told, and try their luck at the games. But when they get there some odd things happen to the twins. A fortune-teller warns Jessica to stay away from the carnival. And a mysterious girl named Clair seems to appear out of nowhere and suddenly becomes best friends with Elizabeth.

Elizabeth is strangely drawn to Claire. She begins to ignore her friends, her chores, and even her sister to spend time with her new friend. It's as if she's under an evil spell...a spell no one, not even Jessica, can break. And if her twin is in danger, how can Jessica help her?

Super Edition: The Big Camp Secret

Girls, boys, and ghosts . . .

Identical twins Jessica and Elizabeth Wakefield can't believe they're finally at sleep-away camp.  Even though there are no boys, and Elizabeth's friend Grace had to cancel her plans to go at the last minute, it mall be two whole weeks of fun, fun, fun!

The twins waste no time diving into their favorite activities.  Jessica begins to arrange a rendezvous with the boys' camp across the lake.  Elizabeth spends much of her time horseback riding and making new friends.  But the real excitement starts when Grace turns up in the most unexpected place.

Should the twins take a chance and hide Grace?  If they do and they're caught, camp may just turn out to be the worst two weeks of their lives!