The Meldrews go on holiday to Portugal with Mrs Warboys, who is hoping for romance with her penpal Alfonso. Photographer Martin Trout follows them there, believing they have a roll of film that belongs to him.

The consuming passion between Pedro I of Portugal and Ines de Castro is brutally interrupted when Ines is executed, as a consequence of political intrigue and in the name of the kingdom's interests. Pedro, cruelly hurt, pursues the single-minded purpose of avenging his lost love. He captures and kills the executioners, and compels the nobility to acknowledge Ines as his lawful wife and Queen of Po...