At 17 he is on the cusp of joining the working world, so
this one should be required reading
Onto more serious matters ...
Our Man in Havana, The Quiet American, and any of the politically edged novels.
The Power and the Glory too.
I agree about TPATG. If he likes Greene, Conrad would be a good shout.
Lord Jim is my favourite (about a young man who can't get over himself),
The Secret Agent has returned to being politically topical 100 years after it was written,
Heart of Darkness can be whipped through in three seconds flat and the short stories generally published with
The Secret Sharer make pleasant diversions between larger books.
Have you got anything tending to sci-fi on the list? Wymondham? Gibson? Dick?
Also, any Douglas Coupland?
Girlfriend in a Coma and
Hey Nostradamus are my favourites.
Microserfs is also good but a bit dated if this teenager doesn't have a knowledge of mid 1990s computing hardware and software.