Point Blanc (Alex Rider #2) by Anthony Horowitz (preloved/used/secondhand book)

MI6 assigns Alex Rider, 14, undercover at an elite prep school for teen rebels after two fathers are assassinated. Principal Dr Grief and vicious cigar-smoking Mrs Stellenbosch are the only teachers. All the students act studious, perfect - and identical. When Alex finds the plot, the villains find him, and the mountain peak has only a black ski run escape.