EVA IBBOTSON - The Haunting of Hiram

The Haunting of Hiram is a wonderfully spooky young fiction title
 
'I will buy your castle,' declared Hiram C. Hopgood. 'But only if there are no ghosts!'

Alex MacBuff can't afford to keep his beloved Castle Carra, and an American millionaire has made him an offer he can't refuse. The castle is shipped all the way to Texas, but its ghostly inhabitants, including Krok the Viking warrior and a hell-hound called Cyril, follow their home across the Atlantic. How can Alex stop them haunting Hiram and also save the millionaire's daughter from an evil ransom plot?