The title refers to Madrid's central square (from which all distances within Spain are measured). Zero may also describe the state of the lives of 14 strangers. The stories of these fourteen collide at this meeting point on a sultry August afternoon. Mistaken identities and second chances are among the results of this comedy of errors featuring, among other characters, a horny & gay university student, an internet-love seeker flamenco dancer, a macho but lovelorn gigolo, an actress, and a businessman starved for new sexual experiences.