Rich boy makes friends with a boy from a socially deprived background, rich boy is killed in a car crash & years later his mum searches for the other boy.

[Helen]

Please help me find the name of this book. I have read it within the last couple of years. A boy from a well to do family makes friends with a boy who comes from a socially deprived background, the well to do boy dies jn a car crash and his mum goes on a hunt later in life to find the other boy

[Kris]

Helen, what's the genre (which we need to add to the topic header) - e.g., fiction or nonfiction? for teens or adults? mystery, literary fiction, etc.?

Why does the mother search for the other boy?
How old was her son when he died?
Story's time period and location/ country?

I copied a few details to the topic header. Feel free to edit it.