Before Reading the Novel

Before I start to read the novel I would like to say some words about what I expect:

When I look at the cover of the novel I see a mysterious blue shadow of boy or girl (I think it's a boy because the book itself is called river boy) jumping down in a lake within a waterfall. Down on the left side there is a black rock. In the background on the picture there are lots of green trees and plants. So all in all it looks like a mysterious place in a rain forest.
Another aspect is the backside of the cover. There is the same picture without this shadow of the boy. That really makes me thinking about whether it is an aim of the novel's cover. I can't know. However I think this boy, the river boy, will have to have an important role in the book.
Furthermore the style of lettering on the cover looks really mysterious. "Tim Bowler" looks like as if it is written by a nib (Schreibfeder). The next line "winner of the Carnegie Medal" (the medal itself is also on the book's cover on the upper right side) is written in the same style. Only the colour changes from yellow into purple. The title of the novel is printed on the cover in silver. This purposes that it catches the eye of the reader.
To precise those facts into my expectation of the novel I say the novel will be really mysterious and a "river boy" will play a certain role in it. That's what I expect.