The House in Hiding, introduced Ian and Sovra, the children of the local doctor living in a remote village on the west coast of Scotland, and so began a 10-book series completed in 1976 with The Floodmakers. In the series, Ian and Sovra are joined in their adventures by the runaway orphan, Cathie. Their adventures include tracking down deer poachers and recreating the flight of a Jacobite fugitive in order to prove his innocence. The vividly described Scottish setting - the sandy beaches of Arisaig - plays an active role, with the children making use of their knowledge and physical skills to achieve their ends.