Joan Aiken 
Cold Shoulder Road [EPUB ebook] 

Arun returns to his mother’s house on Cold Shoulder Road, only to find it deserted and flood-ravaged. Some say she’s run off with a Silent Sect, other whisper that she’s a witch, and Mrs Boles mutters fearfully about the Emjee and the Handsel child, but dares say no more. With the help of his indomitable cousin, Is Twite, Arun sets off in search of Admiral Fishkin – their only key to discovering the real truth, whatever it may be…