The incredible story of Los Xey, a musical group born in San Sebastián, Spain, in 1940, which achieved and maintained an extraordinary worldwide success until its dissolution in 1961.

Arnold, an unemployed middle-aged mouse, confides to his wife Maria that he suspects his entire world is nothing more than a set, and his life a scripted performance. When his best friend Ramiro dies under mysterious circumstances, he traces the conspiracy to a monolithic corporation whose influence reaches every corner of their daily lives.