ABANDONED. Book about a camp for smart people where the main character tries to solve a mystery, meets a girl named Star (international student?), end up exploring a cave with childhood friend who loves him

[Harry]

Book about a camp for smart people (I think) where the main character tries to solve a mystery, meets a girl named Star (international student?), end up exploring a cave with childhood friend who loves him (no spoiler)
Star is injured, MC is airlifted at the end (I think)
Interesting novel about love and crime (murder)

[Harry]

Read this about 7 years ago so details are very fuzzy
I also remember a scene in the cave where the girl best friend has a knife in her hand while both her and the MC are lying down with the light out talking about being together forever.

[Lobstergirl, au gratin]

Children's, YA or adult?
Cover?
Author's gender?

[Harry]

Young Adult, forgot cover, Authors gender unknown

[Kate]

Harry ~~
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[Kris]

No response, moving to Abandoned folder.

Harry (OP) was last active on the site in March 2019.