Carlos, veterinary, poet, musician in his spare time and a fun-minded Don Juan,pretends to be his friend Fernando who has inherited a pharmacy in Madrid. There he meets an old girl friend that attracts him.

Nouveau-riche industrialist returns to Spain after 20 years in Mexico and discovers that his adopted son wants to marry into an aristocratic family and is trying to disguise his family history. Meanwhile, the young man's birth mother also shows up, and....