Dread Companion
Hired as a teacher and governess to two young children on the planet Dylan, Kilda found that her charges had an invisible companion. She soon found that the companion was not imaginary at all when it led the children into an other-dimensional world. Though the other world has danger on every hand, Kilda follows the children across the spatial barrier, knowing she is their only hope.
Andre Norton
Andre Alice Norton (1912-2005) was an American science fiction and fantasy author (with some works of historical fiction and contemporary fiction) under the noms de plume Andre Norton, Andrew North and Allen Weston. Norton published her first novel in 1934, and was the first woman to receive the Gandalf Grand Master Award from the World Science Fiction Society in 1977, and won the Damon Knight Memorial Grand Master Award from the Science Fiction and Fantasy Writers of America (SFWA) association in 1983.
Dark Companion
Dark Companion consists of two primary books, and includes one additional book that complement the series but is not considered mandatory reads. The current recommended reading order for the series is provided below.