Robbie and Beka have been ghost twins for 50 years. They live happily with their ghost dog in a house near Kickingbird Lake. A house which is about to become a holiday home for the Shook family - and that's when the spooky adventures begin.

When their ghost dog Thatch becomes so interested in a library book about castles that he "smooshes" into the book, ghost twins Robbie and Beka must journey into a medieval world in order to get him back

A young woman is haunted by the ghost of her conjoined twin, in Lisa Brown's The Phantom Twin, a sweetly spooky graphic novel set in a turn-of-the-century sideshow. Isabel and Jane are the Extraordinary Peabody Sisters, conjoined twins in a traveling carnival freak show—until an ambitious surgeon tries to separate them and fails, causing Jane's death. Isabel has lost an arm and a leg but gained a ghostly companion: Her dead twin is now her phantom limb. Haunted, altered, and alone for the first time, can Isabel build a new life that's truly her own?

Sweet Valley Twins.

Miranda's twin sister fied when they were two, but now Melody has come back to stop their mom from marrying the wrong man.

The Shook family moves into the Ghost Twins' former home-and they bring a cat. How will Thatch, the Ghost Dog, handle a cat in his house? And what about the treasure the Shook kids find near the shore at Kickingbird Lake? The treasure belongs to the Ghost Twins-and they want it back. . . .