Jon Mayhew 
Deathmire [EPUB ebook] 

Tom Striker is a mud lark, earning a crust foraging on the banks of The Thames for anything worth selling. When his friend Billy goes missing, and he saves a man claiming to be Old Father Thames, Tom and his friends are caught up in a battle between powerful spirits. This title is published by Franklin Watts EDGE, which produces a range of books to get children reading with confidence. EDGE – for books children can’t put down.