The Sign of the Sinister Sorcerer — John Bellairs

It is finally the summer holidays, and Lewis is looking forward to the break from school and spending time with his best friend Rose Rita, his Uncle Jonathan and his neighbour Mrs Zimmermann.But Lewis's hopes for a peaceful summer holiday are shattered as one accident after another plagues him. Is all his bad luck really just a coincidence? Or does it have something to do with the mysterious hooded figure he keeps seeing?For fans of Goosebumps.