In this ambitious first person narrative, Marcello Di Cintio shares tea with Saharan refugees on the wrong side of Morocco's desert wall. He meets with illegal Punjabi migrants who have circumvented the fencing around the Spanish enclave of Ceuta. He visits fenced-in villages in northeast India, walks Arizona's migrant trails, and travels to Palestinian villages to witness the protests against Israel's security barrier.

From Native American reservations on the U.S.-Mexico border and the "Great Wall of Montreal" to Cyprus's divided capital and the Peace Lines of Belfast, Di Cintio seeks to understand what these structures say about those who build them and how they influence the cultures that they pen in. He learns that while every wall fails to accomplish what it was erected to achieve - the walls are never solutions - each wall succeeds at something else. Some walls define Us from Them with Medieval clarity. Some walls encourage fear or feed hate. Some walls steal. Others kill. And every wall inspires its own subversion, either by the infiltrators who dare to go over, under, or around them, or by the artists who transform them.