This is a booklet of instructions for making the two afghans that can be seen in the photos. It is not a conventional pattern. If you can make granny squares you can make this.
The background is made first and the walls added later. It can be made using any yarn and hook. The yarn chosen will determine the finished size.
Walls of Troy is based on a drawing from 'Mazes' by Adrian Fisher and Diana Kingham The caption to the drawing says 'Walls of Troy in Holderness, Humberside, was an unusually shaped maze some 40 feet (12 metres) in diameter. It was destroyed after 1815.' It has 12 sides.
The same book explains that mazes are of pagan origin but were adopted and adapted by the Christian church. It says The earliest surviving full-sized example is the ‘Chemin de Jerusalem’ pavement maze in the nave of Chartres Cathedral, France, built in 1235 .... They represented the path of life and reflected the recent journeys of the Crusaders; reaching the centre symbolised reaching both Jerusalem and salvation.
The Chartres Cathedral Maze is so similar to the Walls of Troy that the variation is included in the booklet.