Martin Sourdough is a homeless person who has chosen to turn his back on the corporate, material world; Willis Hancocks Jr. is a barrister, an alcoholic philanderer, and a misogynist; and Evelyn (aka Yvonne) is a prostitute. Turnstiles speaks to these social problems through the smaller scope of each character's individual trials. There is a struggle that exists between the need to serve one's own needs and the expectation to participate in the larger social scheme. Martin and Willis are both trying to fit into the world, but on their own terms. They are naïve, searching for an Eden-like state of being. Through a broader experience of personal fortune, misfortune, travel, and social interactions, they each learn to accept their path and take control of their own destinies.