Double Trouble Squared

by Kathryn Lasky

Published 15 November 1991
In London with their family, telepathic twelve-year-old twins Liberty and July receive strange emanations from an early residence of Arthur Conan Doyle and discover a literary ghost.

Voice in the Wind

by Kathryn Lasky

Published 31 December 1993
The two sets of Starbuck twins, in New Mexico with their father, meet a six-hundred-year-old Native American ghost and use their telepathic powers to capture the looters of ancient Anasazi artifacts.