Star Trek: Starfleet Academy #3

Cadets Jay-Den and Kyle have disappeared — and if Genesis, Caleb, and Tarima weren't busy battling the harsh environment of S'Eekay II, running a search-and-rescue mission for one of their reckless instructors, and developing an entirely new method of communication within the silent force field around the planet, they might have noticed sooner.

Now they must make a decision: wait for the Academy to rescue them all, or free their crewmates and friends from what is surely a hostile alien abduction.