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Anthony Horowitz: Skeleton Key (2006, Speak)

Reluctant teenage-spy Alex Rider, on a routine mission at the Wimbledon tennis championships, gets caught …

Review of 'Skeleton Key' on 'Goodreads'

Just as good as the other two, I can see how these could really grip teens. The tennis opening actually stuck in my head for the last decade or more, so that's pretty impressive right there.