Margaret Ryan 
The Riddle of Dr Sphinx [PDF ebook] 

Jonny Smith»s paper round takes him along Weir Street. The paper boys
don»t normally stick around for long and he soon understands
why …
It»s definitely weirder than your average street. And this time
Jonny has to deliver a paper to Doctor Sphinx. Will he be brave enough to find out what is
lurking in the deep jungly garden?
The
Weird Street mini-series
follows Jonny on his bizzare, scary and extremely unusual paper round,
where he bumps into a whole range of oddballs and mysterious neighbours.