There is a particular silence that fills a house when the person whose laugh made it a home is gone.
Mokhtar Bouzid has delivered mail in M'sila for thirty-one years. He knows the city's rhythms the way a musician knows a song. He also knows how to make every person on his route laugh - the hardware shop owner, the boy locked out of his building, the imam who pretends not to find things funny. What Mokhtar does not know is when he himself last laughed. Not smiled. Not chuckled politely. Laughed. The sound has left him, and he cannot remember the day it went. When a letter arrives that will change everything - not for the city, but for the one man who carries all its letters - Mokhtar discovers that the cost of making everyone else happy is a debt that eventually comes due.