Spy Ski School

Spy Ski School (Spy School Book 4) by Stuart Gibbs

In this Spy School book, there is little pretence of actual school work. A group is asked to go out to Vail to go to ski school. A Chinese tycoon has rented out an entire hotel and seems to be up to something nefarious. They are not sure what is goin on. However, he is there with his daughter. The goal is to get close to the girl in ski school and hope to discover what is going on. Things get a bit more complex when the protagonist's best friend shows up. They go through a number of twists and turns before discovering a plot to detonate a nuke and corner the molybdenum market. It all has fairly "Get Smart" style of comedy adventure, with a bit of middle school "romance" thrown in.