I read Callan Wink’s “One More Last Stand” about an ongoing affair of two friends who only saw one another at a battle scene reenactment.
http://granta.com/one-more-last-stand/
This graph illuminates how the affair Perry and Kat are having is only known by one side of the network. Andy, Perry’s wife, has no idea about what is going on. However, Kat’s husband John is more connected to Perry, and could therefore figure out the affair based on his connections. The limitations of this network graph is that the strength of each relationship cannot be explained. As a matter of fact, the graph only shows that a relationship or connection exists, and not to what extent or what that connection is.
