Jaime Masaguet

Mary dreams of following the footsteps of his mother, Stella Marco, once famous popular singer. Both survive renting rooms to people in show business. Determined to follow the career of her mother, Mary fails in her first attempt to succeed in the theater. But the faintness of the star at the premiere of a play will be her big chance. Mary has an unexpectedly huge success and becomes 'Miss Cuplé'.

A police inspector instructs his men on how to behave by explaining the development of two criminal cases.