Mr Majeika and the School Caretaker, Paperback

When old Mr Jenks retires, St Barty's School advertises for a new caretaker. Unfortunately there's only one applicant - Hamish Bigmore's Uncle Wilf who is just as rude and bad-tempered as Hamish. When Mr Majeika is hurt in an accident it becomes clear that Uncle Wilf is working for the wickedest of witches, Wilhelmina Warlock.