Calista, Zoe, Holly, and Denise were inseparable best friends when they spent their summers together at sleepaway camp. But after an unexplained tragedy forced the camp to close, the girls drifted apart.

Years later, reunited at their beloved camp counselor Violet's funeral, the four former best friends quickly realize how much they've changed over the years. But despite their differences, they agree on one thing--Violet's so-called accidental death was actually murder.

Unwilling to leave the case unsolved, they set off to uncover the truth--even if it means revealing the dark secrets of their pasts.

But someone wants them to stop investigating, and the anonymous threats keep coming, leaving them suspicious of everyone.

No one can be trusted, not even the girls from Hush Cabin.