Susan Cooper

At the end of a winter-long journey into manhood, Little Hawk returns to find his village decimated by a white man's plague and soon, despite a fresh start, Little Hawk dies violently but his spirit remains trapped, seeing how his world changes.

Returning home to Toronto, Canada, after visiting the Scottish castle inherited by her family, twelve-year-old Emily finds that she has accidentally brought back with her a boggart, an invisible and mischievous spirit with a fondness for practical jokes.