Vashti Hardy: 2 books

Twins Arthur and Maudie receive word that their father died in a failed attempt to reach South Polaris. But a mysterious clue leads the twins to question the story they've been told, and they join the crew of a new exploration attempt in the hope of learning the truth. Will Arthur and Maudie find the answers they seek?

A mind-bending adventure from the author of Brightstorm! A year after the death of her older brother, Prue Haywood's family is still shattered by grief. But everything changes when a stranger arrives at the farm. A new, incredible technology has been discovered in the city of Medlock, where...