From Hugh Howey's World of WOOL...

Throughout human history, public executions have been a means for the powers that be to punish and deter those who would commit crimes against the state.

Crucifixion. Hanging. Firing squad. Cleaning.

Yet when Echo Medley's dearest friend goes missing, she learns that some punishments are best meted out in private. Her journey into the heart of the silo she has called home all her life will shake not only her faith in it, but humanity itself...