Dark Secret of Weatherend, The

When Anthony Monday and Miss Eells find J. K. Borkman's diary, they think it contains the ravings of a lunatic. But soon violent hailstorms and blizzards rage across the land, and they must accept the frightening words: Borkman's son, carrying on his father's work, intends to turn into an icy wasteland. As the final blizzard explodes, they confront the evil Anders Borkman deep inside his father's tomb. How can they defeat such a formidable enemy -- and is there still time?

synopsis from Bellairsia.com