Spanish version of the MGM romance, His Glorious Night: in the old Austro-Hungarian empire, a princess rejects her arranged marriage and loves, instead, a dashing cavalry captain.
A young printer's relationship with his girlfriend is in trouble after she accepts another suitor's invitation to the fair. This adaption of a popular operetta aims to please with a simple storyline and goofy slapstick.
Clara, determined to earn her living and be valued for herself, leaves his rich father's home, changes her name and takes a room. While copying paintings at El Prado Museum, she meets Juan, who is also hiding his identity, pursued under charge of murder.