While gathering experience required for graduating, Sera and three classmates are separated from their camping group by a rainstorm and a flood. They spend the night on higher ground...and that's when when the personal threats and mind games begin. You'll want your nightlight during those. Then the story crescendos into what could've been a terrifying climax, but is only mildly interesting as the attacker is a dull cliché. Stop reading at chap 31.