Two soldiers in a small unit stranded in the field await a signal from their radio. The first soldier tests the others’ attentiveness with furtive glances, using a mirror to reflect sunlight onto the second’s face, eventually revealing their relationship as reciprocal, not just imagined. But when the signal they’ve been waiting for finally arrives while the two are separated during a routine watchman shift, they must confront the possibility that the tenderness they’ve protected against erasure, the thing that has kept them alive, might also be mere rehearsal for the heartsickness promised by the world to come.