It has been five years since biochemical warfare destroyed the world. Five years since anyone could breathe the air outside of the cavern. And almost five years since the inhabitants of the cavern have seen any outsiders besides the group known as the Elite, who allow them to live there. Until Elsie shows up.

Elsie can't remember where she came from or how she got here. And she doesn't remember the world ending. Luckily, the cavern inhabitants are kind and understanding-except for Angelo, who thinks she is a spy for the Elite. Soon Elsie becomes enmeshed in cavern living and indispensable to those around her. But Angelo can't help but wonder if she knows more than she's letting on.

A dystopian young adult novel, The Cavern explores questions of hope, love, and survival at the world's end.