Christmas is in the air as teen-age twins Chris and Susan Pratt head to their grandparents' house in a charming, snow-covered village in Vermont. But the girls do more than engage the entire town in a festive holiday celebration. With their usual cleverness, they use their identical appearance to solve a mystery that threatens to close the local children's hospital. Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper

Puzzled by what makes boys tick, 17-year-old identical twins Chris and Susan Pratt hatch a clever plan: Chris will go undercover as a boy, pretending to be "Charlie" for a week. Chris isn't only surprised by what she learns about the boys she knows—and thought she knew—she also learns unexpected lessons about the roles both boys and girls are programmed to play. Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper

During a school trip to Washington, D.C., identical teen-age twins Chris and Susan Pratt get involved in a lot more than sightseeing. A beautiful Russian ballet dancer with a secret draws them into the most daring—and the most dangerous—adventure of the girls' entire lives. Will Chris and Sooz's identical appearance, along with their cleverness, help them win this high-stakes game? Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper

The teen-age Pratt twins—shy Susan and outgoing Christine—decide to share the honor when Chris is chosen Queen during their hometown’s Centennial Week celebration. They take turns being Chris so they can both enjoy the festivities—as well as the new romance each girl finds. But when the Mayor’s jealous daughter finds out about their scheme, will she blow their cover? Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper

Teen-age twins Christine and Susan Pratt are excited about working as counselors at a lakeside summer camp. But they quickly learn there are strange goings-on at Camp Pinewood. Someone is sabotaging it, and with supplies mysteriously disappearing and plans being ruined, it's in danger of closing. The clever twins put their sleuthing skills to work, hoping to solve the mystery and save the camp. Third in the Pratt twins series. Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper

Is the decaying Victorian mansion on Crabtree Hill really haunted? Identical twins Chris and Susan Pratt decide there's no time like Halloween to find out. Then another mystery arises: what to do when they both fall for the same boy. A third mystery: how to make the annual Halloween Dance special. The girls encounter unexpected tricks and treats as they cleverly solve all three mysteries. Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper