marking and disturbing, high quality children's literature

Damien Decarolis, Dam DeCaro (queen of diamonds?), Aged 16, was a young, rather shy and withdrawn, until he meets Samy, which illuminates his days, by listening and friendship. Dam is a little whipping boy of the school, regularly victim of the band skaters, and it makes Samy pissed. Samy and his band, dressed in black, piercings, black eyeliner ... this would not please to Damien's parents.
Dam is a young delinquent, who has found solace as self-mutilation, scarification by daily.
A dark and disturbing story that plunges us snorkeling in the life of Dam, and the lack of communication and misunderstanding between his parents and himself. Where they only see bad influences and fear of homosexuality, Dam only see softness and wellness. The pressure rises to that end so terrible, terrible, but logical and obvious. A huge slap for the reader who remains in a moment shattered. And it was not the end, the text incorporates, offering a more optimistic ending.
I like this youth then literature, strong, committed, disturbing, leaving her dazed player and uncomfortable. I like the least possible alternative end. But what is funny is that other players do not have that impression at all: what I take for an alternate ending, they took for a rebound of the novel: it was not just a bad dream, it could not end like that, it was just a cog in the plot, but the real purpose, the single, it's the last.
In any case, for a first novel, this is a masterstroke: everything is under control there, fearful and sensitive, and undeniably striking.